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

2019 ◽  
Vol 40 (8) ◽  
pp. 3731-3747
Author(s):  
Shasha Shang ◽  
Gaofeng Zhu ◽  
Ruolin Li ◽  
Jie Xu ◽  
Juan Gu ◽  
...  
Keyword(s):  
Summer Precipitation ◽  
Northwest China ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Decadal Change ◽  
Atmospheric Circulations ◽  
Surface Temperatures

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 Preliminary analyses on characteristics of sea surface temperatures in Kuroshio and its extension and relations to atmospheric circulations

2012 ◽  
Vol 61 (16) ◽  
pp. 169201
Author(s):  
Wang Shan-Shan ◽  
Guan Yu-Ping ◽  
Li Zhi-Jin ◽  
Chao Yi ◽  
Huang Jian-Ping
Keyword(s):  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Atmospheric Circulations ◽  
Surface Temperatures

scholarly journals Rising Mediterranean Sea Surface Temperatures Amplify Extreme Summer Precipitation in Central Europe

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Claudia Volosciuk ◽  
Douglas Maraun ◽  
Vladimir A. Semenov ◽  
Natalia Tilinina ◽  
Sergey K. Gulev ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Central Europe ◽  
Summer Precipitation ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Surface Temperatures

scholarly journals Sensitivity of summer precipitation to tropical sea surface temperatures over East Asia in the GRIMs GMP

2013 ◽  
Vol 40 (9) ◽  
pp. 1824-1831 ◽  
Author(s):  
Eun-Chul Chang ◽  
Sang-Wook Yeh ◽  
Song-You Hong ◽  
Renguang Wu
Keyword(s):  
East Asia ◽  
Summer Precipitation ◽  
Sea Surface ◽  
Sea Surface Temperatures ◽  
Surface Temperatures ◽  
Tropical Sea

scholarly journals Natural variability of the Keetch - Byram Drought Index in the Hawaiian Islands

2009 ◽  
Vol 18 (4) ◽  
pp. 459 ◽  
Author(s):  
Klaus Dolling ◽  
Pao-Shin Chu ◽  
Francis Fujioka
Keyword(s):  
Soil Moisture ◽  
Drought Index ◽  
Hawaiian Islands ◽  
Natural Variability ◽  
Sea Surface ◽  
Daily Maximum ◽  
Sea Surface Temperatures ◽  
Atmospheric Circulations ◽  
Surface Temperatures ◽  
Maximum Temperatures

The Hawaiian Islands experience damaging wildfires on a yearly basis. Soil moisture or lack thereof influences the amount and flammability of vegetation. Incorporating daily maximum temperatures and daily rainfall amounts, the Keetch–Byram Drought Index (KBDI) estimates the amount of soil moisture by tracking daily maximum temperatures and rainfall. A previous study found a strong link between the KBDI and total area burned on the four main Hawaiian Islands. The present paper further examines the natural variability of the KBDI. The times of year at which the KBDI is highest, representing the highest fire danger, are found at each of the 27 stations on the island chain. Spectral analysis is applied to investigate the variability of the KBDI on longer time scales. Windward and leeward stations are shown to have different sensitivities to large-scale climatic fluctuations. An El Niño signal displays a strong relationship with leeward stations, when examined with a band-pass filter and with a composite of standardized anomalies. Departure patterns of atmospheric circulations and sea surface temperatures over the North Pacific are investigated for composites of extremely high KBDI values when fire risk is high. The winter, spring, and fall show anomalous surface anticyclonic circulations, surface divergence, and subsidence over the islands for the upper quartile of KBDI. The winter, spring, and fall composites of equatorial sea surface temperatures for the upper quartile of KBDI are investigated for possible links to atmospheric circulations. These analyses are an effort to allow fire managers some lead time in predicting future fire risks.

Sign in / Sign up

Export Citation Format

Share Document