An efficient forward model of the climate controls on interannual variation in tree-ring width

2010 ◽  
Vol 36 (11-12) ◽  
pp. 2419-2439 ◽  
Author(s):  
Susan E. Tolwinski-Ward ◽  
Michael N. Evans ◽  
Malcolm K. Hughes ◽  
Kevin J. Anchukaitis
Keyword(s):  
Tree Ring ◽  
Interannual Variation ◽  
Ring Width ◽  
Forward Model ◽  
Tree Ring Width ◽  
Climate Controls

scholarly journals Erratum to: An efficient forward model of the climate controls on interannual variation in tree-ring width

2011 ◽  
Vol 36 (11-12) ◽  
pp. 2441-2445 ◽  
Author(s):  
Susan E. Tolwinski-Ward ◽  
Michael N. Evans ◽  
Malcolm K. Hughes ◽  
Kevin J. Anchukaitis
Keyword(s):  
Tree Ring ◽  
Interannual Variation ◽  
Ring Width ◽  
Forward Model ◽  
Tree Ring Width ◽  
Climate Controls

scholarly journals Assimilation of Pseudo-Tree-Ring-Width observations into an Atmospheric General Circulation Model

2016 ◽  
Author(s):  
Walter Acevedo ◽  
Bijan Fallah ◽  
Sebastian Reich ◽  
Ulrich Cubasch
Keyword(s):  
Tree Ring ◽  
Tree Growth ◽  
General Circulation ◽  
Climate Model ◽  
Global Climate Model ◽  
Ring Width ◽  
Circulation Model ◽  
Forward Model ◽  
Limiting Factors ◽  
Tree Ring Width

Abstract. We investigate the assimilation of Tree-Ring-Width (TRW) chronologies into an atmospheric global climate model using Ensemble Kalman Filter (EnKF) techniques and a process-based tree-growth forward model as observation operator. Our results, within a perfect-model experiment setting, indicate that the non-linear response of tree-growth to surface temperature and soil moisture does deteriorate the operation of the time-averaged (EnKF) methodology. Moreover, this skill loss appeared significantly sensitive to the structure of growth rate function, used to represent the Principle of Limiting Factors (PLF)s within the forward model. On the other hand, it was observed that the error reduction achieved by assimilating a particular pseudo-TRW chronology is modulated by the strength of the yearly internal variability of the model at the chronology site. This result might help the dendrochronology community to optimize their sampling efforts. In our experiments, the ''online'' (with cycling) paleao Data Assimilation (DA) approach did not outperform the ''offline'' (no-cycling) one, despite its considerable additional implementation complexity.

scholarly journals Assimilation of pseudo-tree-ring-width observations into an atmospheric general circulation model

2017 ◽  
Vol 13 (5) ◽  
pp. 545-557 ◽  
Author(s):  
Walter Acevedo ◽  
Bijan Fallah ◽  
Sebastian Reich ◽  
Ulrich Cubasch
Keyword(s):  
Tree Ring ◽  
Tree Growth ◽  
General Circulation ◽  
Climate Model ◽  
Global Climate Model ◽  
Ring Width ◽  
Circulation Model ◽  
Forward Model ◽  
Limiting Factors ◽  
Tree Ring Width

Abstract. Paleoclimate data assimilation (DA) is a promising technique to systematically combine the information from climate model simulations and proxy records. Here, we investigate the assimilation of tree-ring-width (TRW) chronologies into an atmospheric global climate model using ensemble Kalman filter (EnKF) techniques and a process-based tree-growth forward model as an observation operator. Our results, within a perfect-model experiment setting, indicate that the "online DA" approach did not outperform the "off-line" one, despite its considerable additional implementation complexity. On the other hand, it was observed that the nonlinear response of tree growth to surface temperature and soil moisture does deteriorate the operation of the time-averaged EnKF methodology. Moreover, for the first time we show that this skill loss appears significantly sensitive to the structure of the growth rate function, used to represent the principle of limiting factors (PLF) within the forward model. In general, our experiments showed that the error reduction achieved by assimilating pseudo-TRW chronologies is modulated by the magnitude of the yearly internal variability in the model. This result might help the dendrochronology community to optimize their sampling efforts.

Climate control of cambial dynamics and tree-ring width in two tropical pines in Thailand

2021 ◽  
Vol 303 ◽  
pp. 108394
Author(s):  
Nathsuda Pumijumnong ◽  
Piyarat Songtrirat ◽  
Supaporn Buajan ◽  
Sineenart Preechamart ◽  
Uthai Chareonwong ◽  
...  
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Tree Ring Width ◽  
Climate Control

Climatic implications of a 3585-year tree-ring width chronology from the northeastern Qinghai-Tibetan Plateau

2010 ◽  
Vol 29 (17-18) ◽  
pp. 2111-2122 ◽  
Author(s):  
X. Shao ◽  
Y. Xu ◽  
Z.-Y. Yin ◽  
E. Liang ◽  
H. Zhu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Tree Ring ◽  
Ring Width ◽  
Tree Ring Width

Tree growth across the Nepal Himalaya during the last four centuries

2017 ◽  
Vol 41 (4) ◽  
pp. 478-495 ◽  
Author(s):  
UK Thapa ◽  
S St. George ◽  
DK Kharal ◽  
NP Gaire
Keyword(s):  
Tree Ring ◽  
Tree Growth ◽  
Environmental Changes ◽  
Ring Width ◽  
High Elevation ◽  
Forest Growth ◽  
Tree Ring Width ◽  
Early 19Th Century ◽  
Tree Ring Data ◽  
Instrumental Records

The climate of Nepal has changed rapidly over the recent decades, but most instrumental records of weather and hydrology only extend back to the 1980s. Tree rings can provide a longer perspective on recent environmental changes, and since the early 2000s, a new round of field initiatives by international researchers and Nepali scientists have more than doubled the size of the country’s tree-ring network. In this paper, we present a comprehensive analysis of the current tree-ring width network for Nepal, and use this network to estimate changes in forest growth nation-wide during the last four centuries. Ring-width chronologies in Nepal have been developed from 11 tree species, and half of the records span at least 290 years. The Nepal tree-ring width network provides a robust estimate of annual forest growth over roughly the last four centuries, but prior to this point, our mean ring-width composite fluctuates wildly due to low sample replication. Over the last four centuries, two major events are prominent in the all-Nepal composite: (i) a prolonged and widespread growth suppression during the early 1800s; and (ii) heightened growth during the most recent decade. The early 19th century decline in tree growth coincides with two major Indonesian eruptions, and suggests that short-term disturbances related to climate extremes can exert a lasting influence on the vigor of Nepal’s forests. Growth increases since AD 2000 are mainly apparent in high-elevation fir, which may be a consequence of the observed trend towards warmer temperatures, particularly during winter. This synthesis effort should be useful to establish baselines for tree-ring data in Nepal and provide a broader context to evaluate the sensitivity or behavior of this proxy in the central Himalayas.

Relationships between tree-ring width index and NDVI of grassland in Delingha

2006 ◽  
Vol 51 (9) ◽  
pp. 1106-1114 ◽  
Author(s):  
Jicheng He ◽  
Xuemei Shao
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Tree Ring Width

Is temperature still the most limiting factor for growth in northern boreal forests?

The Holocene ◽  
2021 ◽  
pp. 095968362110116
Author(s):  
Jeroen DM Schreel
Keyword(s):  
Tree Ring ◽  
Boreal Forests ◽  
Ring Width ◽  
Temperature Fluctuations ◽  
Limiting Factor ◽  
Tree Ring Width ◽  
Climate Reconstructions ◽  
Latewood Density

Over the last few decades – at a range of northern sites – changes in tree-ring width and latewood density have not followed mean summertime temperature fluctuations. This discrepancy sharply contrasts an earlier correlation between those variables. As the origin of this inconsistency has not been fully deciphered, questions have emerged regarding the use of tree-ring width and latewood density as a proxy in dendrochronological climate reconstructions. I suggest that temperature is no longer the most limiting factor in certain boreal areas, which might explain the observed divergence.

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