TY - JOUR
T1 - Moisture source variations for summer rainfall in different intensity classes over Huaihe River Valley, China
AU - Liu, Yubo
AU - Zhang, Chi
AU - Tang, Qiuhong
AU - Hosseini-Moghari, Seyed Mohammad
AU - Haile, Gebremedhin Gebremeskel
AU - Li, Laifang
AU - Li, Wenhong
AU - Yang, Kun
AU - van der Ent, Ruud J.
AU - Chen, Deliang
PY - 2021
Y1 - 2021
N2 - Rainfall is one of the most influential climatic factors on regional development and environment, and changes in rainfall intensity are of specific concern. In the Huaihe River Valley (HRV), heavy rainfall is a primary trigger of floods. However, the difference in the origin of moisture contributed to heavy rainfall and light rainfall is rarely studied and not entirely understood. This study analyzes the rainfall moisture sources in association with different categories of rainfall intensity over the HRV during 1980–2018 using the Water Accounting Model with ERA-Interim reanalysis and precipitation observations from China Meteorological Administration. The results show that the moisture for the HRV summer rainfall is mainly from terrestrial subregion (40%), the Indian Ocean (27%), the Pacific Ocean (25%), and the local HRV (8%). In addition, moisture sources differ substantially between light and heavy rainfall. Specifically, the local HRV contributes more moisture to light rainfall (12%) compared to heavy rainfall (4%), whereas the Indian Ocean contributes more to heavy rainfall (33%) than to light rainfall (20%). The grids located in the southern source region make higher contribution ratio in heavy rainfall than in light rainfall. These results suggest that moisture from distant oceanic areas, especially the Indian Ocean, plays a crucial role in intense summer rainfall, whereas moisture from the land sources covering local grids plays a dominant role in light rainfall in the HRV.
AB - Rainfall is one of the most influential climatic factors on regional development and environment, and changes in rainfall intensity are of specific concern. In the Huaihe River Valley (HRV), heavy rainfall is a primary trigger of floods. However, the difference in the origin of moisture contributed to heavy rainfall and light rainfall is rarely studied and not entirely understood. This study analyzes the rainfall moisture sources in association with different categories of rainfall intensity over the HRV during 1980–2018 using the Water Accounting Model with ERA-Interim reanalysis and precipitation observations from China Meteorological Administration. The results show that the moisture for the HRV summer rainfall is mainly from terrestrial subregion (40%), the Indian Ocean (27%), the Pacific Ocean (25%), and the local HRV (8%). In addition, moisture sources differ substantially between light and heavy rainfall. Specifically, the local HRV contributes more moisture to light rainfall (12%) compared to heavy rainfall (4%), whereas the Indian Ocean contributes more to heavy rainfall (33%) than to light rainfall (20%). The grids located in the southern source region make higher contribution ratio in heavy rainfall than in light rainfall. These results suggest that moisture from distant oceanic areas, especially the Indian Ocean, plays a crucial role in intense summer rainfall, whereas moisture from the land sources covering local grids plays a dominant role in light rainfall in the HRV.
KW - Heavy rainfall
KW - Huaihe River
KW - Indian Ocean
KW - Moisture source
KW - Water Accounting Model
UR - http://www.scopus.com/inward/record.url?scp=85104269419&partnerID=8YFLogxK
U2 - 10.1007/s00382-021-05762-4
DO - 10.1007/s00382-021-05762-4
M3 - Article
AN - SCOPUS:85104269419
SN - 0930-7575
VL - 57
SP - 1121
EP - 1133
JO - Climate Dynamics
JF - Climate Dynamics
IS - 3-4
ER -