scholarly journals Water Vapor Transport Related to the Interdecadal Shift of Summer Precipitation over Northern East Asia in the Late 1990s

2018 ◽  
Vol 32 (5) ◽  
pp. 781-793 ◽  
Author(s):  
Po Hu ◽  
Minghao Wang ◽  
Liu Yang ◽  
Xiaojuan Wang ◽  
Guolin Feng
Keyword(s):  
Water Vapor ◽  
East Asia ◽  
Summer Precipitation ◽  
Vapor Transport ◽  
Water Vapor Transport ◽  
Interdecadal Shift

Interdecadal Variation of the Relationship between East Asian Water Vapor Transport and Tropical Pacific Sea Surface Temperatures during January and Associated Mechanisms

2019 ◽  
Vol 32 (21) ◽  
pp. 7575-7594 ◽  
Author(s):  
Bo Sun ◽  
Huijun Wang ◽  
Botao Zhou
Keyword(s):  
Water Vapor ◽  
East Asia ◽  
East Asian ◽  
Tropical Pacific ◽  
Vapor Transport ◽  
Sea Surface ◽  
Water Vapor Transport ◽  
The Relationship ◽  
Asian Water ◽  
Sst Anomalies

Abstract This study examined the interdecadal variations in the relationship between the East Asian water vapor transport (WVT) and the central and eastern tropical Pacific (CETP) sea surface temperatures (SSTs) in January during 1951–2018, focusing on the meridional WVT over East Asia, which is critical for the East Asian winter precipitation. The results indicate that before the 1980s, an increased southerly WVT over East Asia was generally associated with warm SST anomalies in the CETP during January, whereas, after the mid-1980s, an increased southerly WVT over East Asia was mostly associated with cold SST anomalies in the central tropical Pacific during January. The underlying mechanisms are discussed based on a comparison on the climate anomalies associated with the East Asian meridional WVT between the periods of 1951–79 and 1986–2018. During 1951–79, the meridional WVT over East Asia was mainly modulated by the Pacific–East Asian (PEA) teleconnection, which would induce an anomalous southerly WVT over East Asia corresponding to warm SST anomalies in the CETP. Whereas, during 1986–2018, the connection between the PEA teleconnection and the East Asian meridional WVT was weakened. The connection among the CETP SSTs, the anomalous zonal circulation over the North Pacific, and the East Asian meridional WVT was enhanced. Additionally, the connection among the CETP SSTs, the circumglobal teleconnection in the Northern Hemisphere, and the East Asian meridional WVT was enhanced. The above two enhanced connections opposed the effect of the PEA teleconnection and would induce an anomalous southerly WVT over East Asia corresponding to cold SST anomalies in the central tropical Pacific.

Decadal change in summer precipitation over the east of Northwest China and its associations with atmospheric circulations and sea surface temperatures

2020 ◽  
Author(s):  
Shasha Shang ◽  
Gaofeng Zhu ◽  
Ruolin Li ◽  
Jie Xu ◽  
Juan Gu ◽  
...  
Keyword(s):  
Water Vapor ◽  
Summer Precipitation ◽  
Northwest China ◽  
Vapor Transport ◽  
Sea Surface ◽  
Water Vapor Transport ◽  
Northwest Pacific ◽  
Sea Surface Temperatures ◽  
Surface Temperatures ◽  
Decadal Variations

<p>As global warming has progressed, precipitation patterns over arid Northwest China have undergone significant change. In this study, changes in summer (JJA) precipitation over the eastern part of Northwest China (ENWC) from 1980 to 2014 were investigated using the China gridded monthly precipitation dataset (CN05.1). The results showed that summer precipitation over the ENWC experienced a decadal wet-to-dry shift in 1998. Westerlies played an important role in the upper atmospheric levels in terms of water vapor transport; the decadal variations in summer precipitation were principally controlled by the water vapor input from the ENWC's western boundary. In addition, the decadal variations in summer precipitation in the ENWC appear to be associated with a meridional teleconnection around 110°E and a zonal pattern over 45–60°N in the lower troposphere. These two teleconnections led to cyclonic anomalies in the ENWC and enhanced water vapor transport into the ENWC, resulting in above-normal precipitation during the 1989–1998 decadal period. Further, the warmer (colder) sea surface temperatures (SSTs) observed in the tropical Eastern Pacific correspond to the southward (northward) displacement of the Asian jet stream and a negative (positive) phase of the Silk Road pattern, resulting in a wet (dry) ENWC. Moreover, the SST anomalies in the North Atlantic and Northwest Pacific may affect summer precipitation over the ENWC via a zonal teleconnection in the middle troposphere. Details about the results will be presented in the conference.</p>

scholarly journals The simulation of water vapor transport in East Asia using a regional air-sea coupled model

2013 ◽  
Vol 118 (4) ◽  
pp. 1585-1600 ◽  
Author(s):  
Suxiang Yao ◽  
Qian Huang ◽  
Yaocun Zhang ◽  
Xu Zhou
Keyword(s):  
Water Vapor ◽  
East Asia ◽  
Coupled Model ◽  
Vapor Transport ◽  
Water Vapor Transport

scholarly journals Variation Characteristics of Summer Water Vapor Budget and Its Relationship with the Precipitation over the Sichuan Basin

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2533
Author(s):  
Dongmei Qi ◽  
Yueqing Li ◽  
Changyan Zhou
Keyword(s):  
Water Vapor ◽  
Sichuan Basin ◽  
Summer Precipitation ◽  
Vapor Transport ◽  
Water Vapor Transport ◽  
Tibet Plateau ◽  
Daily Precipitation Data ◽  
Variation Characteristics ◽  
The Sichuan Basin ◽  
Water Vapor Budget

Based on the daily precipitation data from the meteorological stations in Sichuan and the monthly average ERA-Interim reanalysis data from 1979 to 2016, the variation characteristics of summer water vapor budget in the Sichuan Basin and its relationship with precipitation are discussed in this study. The results show that, in summer, the water vapor in the Sichuan Basin and its four sub-basins flows in from the southern and western boundaries and flows out through the eastern and northern boundaries, and the basin is obviously a water vapor sink. From 1979 to 2016, the water vapor inflow from the southern and western boundaries significantly decreased, as well as the water vapor outflow through the eastern boundary. The summer precipitation in the Sichuan Basin is significantly positively correlated with the water vapor inflow at the southern boundary and net water vapor budget of the basin in the same period, and it is negatively correlated with the water vapor outflow at the northern boundary. The southern and northern boundaries are the two most important boundaries for the summer precipitation in the Sichuan Basin. Additionally, this study reveals that, under the multi-scale topography on the east side of the Tibet Plateau, the spatio-temporal distribution of precipitation in the Sichuan Basin results from the interactions between the unique topography of the Sichuan Basin and the different modes of water-vapor transport from low latitudes. The atmospheric circulation over the key area of air–sea interaction in the tropical region and its accompanying systems, as well as the anomalies of regional circulations and water vapor transport over the eastern China and Sichuan Basin, are the main reasons for the variation in summer precipitation in the Sichuan Basin.

scholarly journals Proof in climatology for circulation effect of stalagmite δ<sup>18</sup>O in East Asia: analysis on the ratios among water vapor transport passageway intensities in East Asia

2013 ◽  
Vol 9 (4) ◽  
pp. 4263-4291
Author(s):  
S. Nan ◽  
M. Tan ◽  
P. Zhao
Keyword(s):  
Water Vapor ◽  
Indian Ocean ◽  
East Asia ◽  
North Pacific ◽  
El Nino ◽  
East Asian ◽  
Tropical Indian Ocean ◽  
Vapor Transport ◽  
Eastern Pacific ◽  
Water Vapor Transport

Abstract. Further verification about the circulation effect of stalagmite δ18O in East Asian monsoon region needs the quantitative description for the proportion of water vapor transport (WVT) from different source regions. WVT passageway intensities are defined as regionally averaged WVT flux modes in this paper. The ratio between two WVT passageways' intensities represents relative intensity of the two WVT passageways. Using the NCEP-NCAR reanalysis data for 1948–2011, the ratios of the intensities of three WVT passageways from low latitudes (the intensity of WVT from Bay of Bengal (IBOB), the intensity of WVT from South China Sea (ISCS) and the intensity of WVT from western North Pacific (IWNP) in summer are calculated. SB is for the ISCS-IBOB ratio, WB for the IWNP-IBOB ratio, and WS for the IWNP-ISCS ratio. The decadal increase occurs in the time series of WB and WS, with higher values in 1976–1995 and lower values in 1950–1975, probably resulting from the strengthening of WVT from WNP in the midterm of 1970s. East Asian atmospheric circulations, WVTs and previous SST characters corresponding to the ratios are analyzed. The result indicates that SB, WB and WS may properly reflect the relative intensities between ISCS and IBOB, between IWNP and IBOB, and between IWNP and ISCS, respectively. For high SB years, the Asian Low and the western Pacific subtropical high (WPSH) weaken. The southwesterly winds from BOB to the Yangtze River valley by the southeast of the Tibetan Plateau weaken and the WVT from BOB to East Asia weakens. The southwesterly winds from SCS to East Asia strengthen and the WVT from SCS to East Asia strengthens. In high WB years, the Asian Low weakens and the WPSH shifts westwards, enhances and enlarges. The WVT from WNP to East Asia increases because of the strengthening of the easterly winds on the south of the WPSH. The westerly winds from BOB to East Asia by Indo-China Peninsula decrease and the WVT from BOB to East Asia weakens. The atmospheric circulation and WVT associated with WS are similar with those associated with WB. There are close relationships between WB (and WS) and the WPSH area, position and intensity. In high WB (and WS) years, the WPSH shifts westwards, enlarges and enhances. There is no obvious anomalous previous SST signal in tropical Indian Ocean and equatorial central and eastern Pacific for anomalous SB years. WB and WS are closely related to previous SST signal. When the equatorial central and eastern Pacific is in El Niño phase, SST in the tropical Indian Ocean, BOB and SCS is high and SST at middle latitudes in North Pacific is low, WB and WS tend to be high. After the midterm of 1970s, the equatorial central and eastern Pacific is often in El Niño phase. It is in agreement with higher WB in 1976–1995 than that in 1950–1975. In light of circulation effect of stalagmite δ18O in East Asia, high WB implies high stalagmite δ18O. Therefore, the interdecadal increase of WB in 1976–1995 than in 1950–1975 provides the proof using the conception of circulation effect to explain the interdecadal change of stalagmite δ18O at most regions in East Asia.

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