scholarly journals Response of <i>Pinus sylvestris</i> var. <i>mongolica</i> to water change and drought history reconstruction in the past 260 years, northeast China

2018 ◽  
Vol 14 (8) ◽  
pp. 1213-1228 ◽  
Author(s):  
Liangjun Zhu ◽  
Qichao Yao ◽  
David J. Cooper ◽  
Shijie Han ◽  
Xiaochun Wang
Keyword(s):  
Pinus Sylvestris ◽  
Northeast China ◽  
Ring Width ◽  
Severity Index ◽  
Drought Severity ◽  
Mongolian Plateau ◽  
The West ◽  
West Central ◽  
Daxing’An Mountains ◽  
Surrounding Areas

Abstract. We present a 260-year annual Palmer drought severity index (PDSI) reconstruction based on a tree-ring width chronology of Scots pine (Pinus sylvestris var. mongolica) from four sample sites in the central Daxing'an Mountains, northeast China. The reconstruction equation explained 38.2 % of the variance of annual PDSI in the calibration period from 1911 to 2010. Our reconstruction confirmed the local historical documents and other nearby hydroclimate reconstructions. Drought in the 1920s–1930s was more severe in the Daxing'an Mountains than in the surrounding areas. A slight moisture increase was identified in the study area, while a warm–dry pattern was found in the west-central Mongolian Plateau (mildly drier) and its transition zones: the west-central Mongolian Plateau (severely drier). Overall, the variation of drought in the Daxing'an Mountains and its relationship with surrounding areas may be affected by the Pacific or Atlantic oscillations (e.g., ENSO, PDO, AMO, NAO and SNAO), which can affect the Asian monsoon, change the local temperature and precipitation, and lead to drought.

scholarly journals Response of <i>Pinus sylvestris</i> var. <i>mongolica</i> to water change and the reconstruction of drought history for the past 260 years in northeast China

2018 ◽  
Author(s):  
Liangjun Zhu ◽  
Qichao Yao ◽  
David J. Cooper ◽  
Shijie Han ◽  
Xiaochun Wang
Keyword(s):  
Pinus Sylvestris ◽  
Northeast China ◽  
Fire History ◽  
Ring Width ◽  
Transition Zones ◽  
The Past ◽  
Temperature And Precipitation ◽  
Daxing’An Mountains ◽  
Surrounding Areas ◽  
Moisture Increase

Abstract. We present a 260-year annual PDSI reconstruction based on a regional tree-ring width chronology of Scots pine (Pinus sylvestris var. mongolica) from four sample sites in the Daxing’an Mountains, northeast China. The model explained 38.2 % of the variance of annual PDSI during the calibration period from 1911 to 2010. Compared with local historical documents, nearby forest fire history data and hydroclimate reconstructions, our reconstruction is accurate and representative, and recorded the same dry years/periods. The drought of 1920s–1930s was more severe in the Daxing’an Mountains than in surrounding areas. A moisture increase caused by a recent rapid warming (warm-wet pattern) was identified for the Daxing’an Mountains, while a warm-dry pattern was found for the East Mongolian Plateaus (mild drier) and their transition zones: the east Mongolian Plateaus (severe drier). Overall, the dry/wet variability of the Daxing’an Mountains and its relationship with the surrounding areas might be driven by Pacific and Atlantic Ocean oscillations (e.g., ENSO, PDO, AMO, NAO and SNAO) that influence the Asian monsoon, and in turn the local temperature and precipitation that influences regional drought. However, the Monsoon Asia Drought Atlas of "Cook" might inaccurately portray dry/wet variations in the Daxing’an Mountains.

Temporal and spatial heterogeneity of drought impact on vegetation growth on the Inner Mongolian Plateau

2018 ◽  
Vol 40 (2) ◽  
pp. 113 ◽  
Author(s):  
Miao Bailing ◽  
Li Zhiyong ◽  
Liang Cunzhu ◽  
Wang Lixin ◽  
Jia Chengzhen ◽  
...  
Keyword(s):  
Vegetation Index ◽  
Severity Index ◽  
Drought Severity ◽  
Summer Drought ◽  
Desert Steppe ◽  
Vegetation Types ◽  
Mongolian Plateau ◽  
Typical Steppe ◽  
Recent Climate ◽  
Normalised Difference Vegetation Index

Drought frequency and intensity have increased in recent decades, with consequences for the structure and function of ecosystems of the Inner Mongolian Plateau. In this study, the Palmer drought severity index (PDSI) was chosen to assess the extent and severity of drought between 1982 and 2011. The normalised difference vegetation index (NDVI) was used to analyse the responses of five different vegetation types (forest, meadow steppe, typical steppe, desert steppe and desert) to drought. Our results show that during the last 30 years, the frequency and intensity of droughts have increased significantly, especially in summer and autumn. The greatest decline in NDVI in response to drought was observed in typical steppe and desert steppe vegetation types. Compared with other seasons, maximum decline in NDVI was observed in summer. In addition, we found that NDVI in the five vegetation types showed a lag time of 1–2 months from drought in the spring and summer. Ancillary soil moisture conditions influenced the drought response, with desert steppe showing a stronger lag effect to spring and summer drought than the other vegetation types. Our results show that drought explains a high proportion of changes in NDVI, and suggest that recent climate change has been an important factor affecting vegetation productivity in the area.

scholarly journals A 424-year tree-ring-based Palmer Drought Severity Index reconstruction of <i>Cedrus deodara</i> D. Don from the Hindu Kush range of Pakistan: linkages to ocean oscillations

2020 ◽  
Vol 16 (2) ◽  
pp. 783-798
Author(s):  
Sarir Ahmad ◽  
Liangjun Zhu ◽  
Sumaira Yasmeen ◽  
Yuandong Zhang ◽  
Zongshan Li ◽  
...  
Keyword(s):  
Tree Ring ◽  
Palmer Drought Severity Index ◽  
Southern Oscillation ◽  
Ring Width ◽  
Severity Index ◽  
Drought Severity ◽  
Mountain Range ◽  
Cedrus Deodara ◽  
Hindu Kush ◽  
Drought Severity Index

Abstract. The rate of global warming has led to persistent drought. It is considered to be the preliminary factor affecting socioeconomic development under the background of the dynamic forecasting of the water supply and forest ecosystems in West Asia. However, long-term climate records in the semiarid Hindu Kush range are seriously lacking. Therefore, we developed a new tree-ring width chronology of Cedrus deodara spanning the period of 1537–2017. We reconstructed the March–August Palmer Drought Severity Index (PDSI) for the past 424 years, going back to 1593 CE. Our reconstruction featured nine dry periods (1593–1598, 1602–1608, 1631–1645, 1647–1660, 1756–1765, 1785–1800, 1870–1878, 1917–1923, and 1981–1995) and eight wet periods (1663–1675, 1687–1708, 1771–1773, 1806–1814, 1844–1852, 1932–1935, 1965–1969, and 1990–1999). This reconstruction is consistent with other dendroclimatic reconstructions in West Asia, thereby confirming its reliability. The multi-taper method and wavelet analysis revealed drought variability at periodicities of 2.1–2.4, 3.3, 6.0, 16.8, and 34.0–38.0 years. The drought patterns could be linked to the large-scale atmospheric–oceanic variability, such as the El Niño–Southern Oscillation, Atlantic Multidecadal Oscillation, and solar activity. In terms of current climate conditions, our findings have important implications for developing drought-resistant policies in communities on the fringes of the Hindu Kush mountain range in northern Pakistan.

scholarly journals Last Millennium Reanalysis with an expanded proxy database and seasonal proxy modeling

2019 ◽  
Vol 15 (4) ◽  
pp. 1251-1273 ◽  
Author(s):  
Robert Tardif ◽  
Gregory J. Hakim ◽  
Walter A. Perkins ◽  
Kaleb A. Horlick ◽  
Michael P. Erb ◽  
...  
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Surface Air Temperature ◽  
Severity Index ◽  
Drought Severity ◽  
Last Millennium ◽  
Tree Ring Width ◽  
Forward Models ◽  
Proxy Records ◽  
Northern Latitudes

Abstract. The Last Millennium Reanalysis (LMR) utilizes an ensemble methodology to assimilate paleoclimate data for the production of annually resolved climate field reconstructions of the Common Era. Two key elements are the focus of this work: the set of assimilated proxy records and the forward models that map climate variables to proxy measurements. Results based on an updated proxy database and seasonal regression-based forward models are compared to the LMR prototype, which was based on a smaller set of proxy records and simpler proxy models formulated as univariate linear regressions against annual temperature. Validation against various instrumental-era gridded analyses shows that the new reconstructions of surface air temperature and 500 hPa geopotential height are significantly improved (from 10 % to more than 100 %), while improvements in reconstruction of the Palmer Drought Severity Index are more modest. Additional experiments designed to isolate the sources of improvement reveal the importance of the updated proxy records, including coral records for improving tropical reconstructions, and tree-ring density records for temperature reconstructions, particularly in high northern latitudes. Proxy forward models that account for seasonal responses, and dependence on both temperature and moisture for tree-ring width, also contribute to improvements in reconstructed thermodynamic and hydroclimate variables in midlatitudes. The variability of temperature at multidecadal to centennial scales is also shown to be sensitive to the set of assimilated proxies, especially to the inclusion of primarily moisture-sensitive tree-ring-width records.

scholarly journals Last 1100 yr of precipitation variability in western central Asia as revealed by tree-ring data from the Pamir-Alay

2018 ◽  
Vol 91 (1) ◽  
pp. 81-95 ◽  
Author(s):  
Magdalena Opała-Owczarek ◽  
Tadeusz Niedźwiedź
Keyword(s):  
Central Asia ◽  
Tree Ring ◽  
Tree Growth ◽  
Palmer Drought Severity Index ◽  
Ring Width ◽  
Severity Index ◽  
Drought Severity ◽  
Mountainous Area ◽  
Transfer Function Method ◽  
Tree Ring Data

AbstractWe developed a 1108 yr chronology of tree-ring widths, based on 64 Himalayan pencil juniper (Juniperus semiglobosa Regel) trees, for the Pamir-Alay Mountains, central Asia. Dendroclimatological analysis demonstrates that precipitation has significant effects on tree growth in the semiarid mountainous area of northwestern Tajikistan located on the edge of the great midlatitude Karakum and Kyzylkum deserts. The highest level of linear correlation (r=0.67) is observed between tree growth and seasonalised winter (previous December–February) precipitation. Our studies also show that moisture (precipitation/Palmer Drought Severity Index) from the previous June to the current September was the dominant climatic factor accounting for interannual variations in tree-ring width, suggesting that this should be considered in climate reconstruction. Using the transfer function method, we reconstructed the region’s drought history over the period AD 908–2015. The results of this moisture reconstruction showed that the most recent millennium was characterised by series of dry and wet stages. The driest periods occurred before 1000, 1200–1250, and at the end of the eighteenth century and beginning of the nineteenth century. The wettest conditions existed in 1650–1700 and after 1990.

scholarly journals Growth response of Abies spectabilis to climate along an elevation gradient of the Manang valley in the central Himalayas

2019 ◽  
Vol 31 (6) ◽  
pp. 2245-2254 ◽  
Author(s):  
Samresh Rai ◽  
Binod Dawadi ◽  
Yafeng Wang ◽  
Xiaoming Lu ◽  
Huang Ru ◽  
...  
Keyword(s):  
Tree Ring ◽  
Elevation Gradient ◽  
Ring Width ◽  
Principal Component ◽  
Moisture Stress ◽  
Severity Index ◽  
Forest Growth ◽  
Drought Severity ◽  
Tree Ring Width ◽  
Standard Tree

Abstract The Himalayas are characterized by a broad gradient of bioclimatic zones along their elevation. However, less is known how forest growth responds to climatic change along elevation. In this study, four standard tree-ring width chronologies of Himalayan fir (Abiesspectabilis) were developed, spanning 142–649 years along an elevation gradient of 3076–3900 m a.s.l. Principal component analysis classified the four chronologies into two groups; the ones at lower elevations (M1 and M2) and higher elevations (M3 and M4) show two distinct growth trends. Radial growth is limited by summer (June–August) precipitation at M3, and by precipitation during spring (March–May) and summer at M4. It is limited by spring temperatures and winter precipitation (December–February) at M1. Tree-ring width chronologies also significantly correlate with winter and spring Palmer Drought Severity Index (PDSI) at M1, and with summer PDSI at M3 and M4. Thus, Himalayan fir growth at high elevations is mainly limited by moisture stress rather than by low temperatures. Furthermore, the occurrence of missing rings coincides with dry periods, providing additional evidence for moisture limitation of Himalayan fir growth.

scholarly journals Development of a Larix principis-rupprechtii tree-ring width chronology and its climatic signals for the southern Greater Higgnan Mountains

2018 ◽  
Vol 45 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Tongwen Zhang ◽  
Shulong Yu ◽  
Yujiang Yuan ◽  
Liping Huang ◽  
Shengxia Jiang
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Low Frequency ◽  
Northern China ◽  
Severity Index ◽  
Drought Severity ◽  
Mountainous Area ◽  
Tree Ring Width ◽  
Large Area ◽  
Climatic Signals

Abstract Forty-one living larch (Larix principis-rupprechtii) trees collected from two sampling sites in 1310–1530 m a.s.l. in the southern Greater Higgnan Mountains in the northeastern China are used to develop a regional tree-ring width chronology. The credible chronology spans 185 years from 1830 to 2014. The results of correlation analyses indicate that moisture is the main climatic factor controlling radial growth of larch trees in this mountainous area. Spatial correlation proves that the regional tree-ring width chronology contains climatic signals representative for a large area including the eastern Mongolian Plateau and Nuluerhu Mountains. A comparison between the newly developed chronology and a May–July Palmer Drought Severity Index (PDSI) reconstruction for the Ortindag Sand Land reveals similar variations, particularly in the low-frequency domain. The tree-ring records also capture a severe and sustained drying trend recorded in the 1920s across a wide area of northern China.

scholarly journals The 600-mm precipitation isoline distinguishes tree-ring-width responses to climate in China

2018 ◽  
Vol 6 (2) ◽  
pp. 359-368 ◽  
Author(s):  
Yu Liu ◽  
Huiming Song ◽  
Changfeng Sun ◽  
Yi Song ◽  
Qiufang Cai ◽  
...  
Keyword(s):  
Tree Ring ◽  
Large Scale ◽  
Ring Width ◽  
Severity Index ◽  
Annual Precipitation ◽  
Drought Severity ◽  
Climate Variations ◽  
Tree Ring Width ◽  
Past Climate ◽  
Tree Ring Data

AbstractThe numerous temperature and precipitation reconstructions in China based on tree-ring-width data have played significant roles in furthering the understanding of past climate changes. However, the geographical variability in the responses of trees to climate variations in China remains largely undetermined. Here, we describe an important spatial boundary in the response of trees to climate variations, namely the 600-mm annual precipitation isoline. We found that, to the north of this line, tree-ring widths are usually positively correlated with precipitation and negatively correlated with growing-season temperature. To the south of this line, the tree-ring widths respond positively to temperature, and winter half-year temperatures are the main reconstructed parameters, especially on the third topographical step of China. We also found that precipitation reconstructions based on tree-ring data and the Palmer Drought Severity Index almost exclusively fall in the region of the 200- to 600-mm annual precipitation isolines, not other regions. Our findings indicate that, when using multiple tree-ring-width chronologies for large-scale past climate reconstructions, the climatic signal of each tree-ring-width series should be carefully considered.

DENDROCLIMATOLOGICAL STUDIES OF PICEA LIKIANGENSIS AND TSUGA DUMOSA IN LIJIANG, CHINA

IAWA Journal ◽  
2009 ◽  
Vol 30 (4) ◽  
pp. 435-441 ◽  
Author(s):  
Gaiai Guo ◽  
Zong-Shan Li ◽  
Qi-Bin Zhang ◽  
Ke-Ping Ma ◽  
Conglong Mu
Keyword(s):  
Tree Ring ◽  
Environmental Variability ◽  
Ring Width ◽  
Correlation Coefficients ◽  
Severity Index ◽  
Drought Severity ◽  
Tree Ring Chronology ◽  
Late 20Th Century ◽  
Moisture Condition ◽  
Individual Trees

Expansion of climate proxy records over space is needed for improving our knowledge of past climate variability. Here we report on a 112-year tree-ring chronology of Picea likiangensis (Franch.) E.Pritz. and a 165- year tree-ring chronology of Tsuga dumosa (D.Don) Eichler for the Lijiang area, northwestern Yunnan, China. Mean correlation coefficients of tree-ring width series among individual trees are 0.48 for P. likiangensis and 0.45 for T. dumosa, indicating a growth response to common environmental variability. Analysis of climate-growth relationships shows that the radial growth of P. likiangensis is mainly negatively correlated with temperature from December of the prior growth year to May of the growth year, and that of T. dumosa is mainly positively correlated with precipitation of January and May in the growth year. We further found that the chronology of T. dumosa can be used to reconstruct the May-June Palmer Drought Severity Index. The reconstruction shows that major wet periods occurred in the 1860s, 1910s and 1940s, and drought periods in 1892–1905, 1914–1924 and 1928–1938. The moisture condition of the late 20th century is characterized by a near-normal state from the 1950s to the 1970s and an increasing trend from 1982 to 2003.

scholarly journals 531-year non-growth season precipitation reconstruction in the southeastern Tibetan Plateau

2021 ◽  
Author(s):  
Maierdang Keyimu ◽  
Zongshan Li ◽  
Bojie Fu ◽  
Guohua Liu ◽  
Weiliang Chen ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Tree Ring ◽  
Tree Growth ◽  
Ring Width ◽  
Severity Index ◽  
Climatic Conditions ◽  
Drought Severity ◽  
Precipitation Reconstruction ◽  
Growth Season ◽  
Southeastern Tibetan Plateau

Abstract. Trees record climatic conditions during their growth, and tree-rings serve as a proxy to reveal the features of the historical climate of a region. In this study, we collected tree-ring cores of forest hemlock (Tsuga forrestii) from the northwestern Yunnan area of the southeastern Tibetan Plateau (SETP), and created a residual tree-ring width (TRW) chronology. An analysis of the relationship between tree growth and climate revealed that precipitation during the non-growth season (NGS) (from November of the previous year to February of the current year) was the most important constraining factor on the radial tree growth of forest hemlock in this region. In addition, the influence of NGS precipitation on radial tree growth was relatively uniform over time (1956–2005). Accordingly, we reconstructed the NGS precipitation over the period spanning from A.D. 1475–2005. The reconstruction accounted for 28.5 % of the actual variance during the common period 1956–2005, and the leave-one-out verification parameters indicated the reliability of the reconstruction. Based on the reconstruction, NGS was extremely dry during the years A.D. 1475, 1656, 1670, 1694, 1703, 1736, 1897, 1907, 1943, 1969, 1982, and 1999. In contrast, the NGS was extremely wet during the years A.D. 1491, 1536, 1558, 1627, 1638, 1654, 1832, 1834–1835, and 1992. Similar variations of the NGS precipitation reconstruction series and Palmer Drought Severity Index (PDSI) reconstructions from surrounding regions indicated the reliability of the reconstruction. A comparison of the reconstruction with Climate Research Unit (CRU) gridded data revealed that our reconstruction was representative of the NGS precipitation variability of a large region in the SETP.

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