scholarly journals Objective quantification of the water vapor path influencing precipitation in North China in summer

2014 ◽  
Vol 63 (12) ◽  
pp. 129201
Author(s):  
Ye Min ◽  
Wu Yong-Ping ◽  
Zhou Jie ◽  
Wu Hao ◽  
Tu Gang
Keyword(s):  
Water Vapor ◽  
North China ◽  
Water Vapor Path ◽  
Objective Quantification

scholarly journals Influence of Arctic Oscillation on Frequency of Wintertime Fog Days in Eastern China

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 162
Author(s):  
Peng Liu ◽  
Mingyue Tang ◽  
Huaying Yu ◽  
Ying Zhang
Keyword(s):  
Water Vapor ◽  
South China ◽  
Arctic Oscillation ◽  
North China ◽  
Eastern China ◽  
Reanalysis Data ◽  
Positive Phase ◽  
Westerly Jet ◽  
Environmental Prediction ◽  
Fog Days

The influence of Arctic Oscillation (AO) on the frequency of wintertime fog days in eastern China is studied based on the winter AO index, the wintertime fog-day data of national stations in China, and the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data from 1954 to 2007. The results show that heavy fog and light fog are more likely to occur during winter in eastern China with the strong interannual variability. During the winter with the positive-phase AO, there are more days of heavy fog in North China but less in South China, while light fog days become more in the whole of eastern China. It is mainly because that when AO is in the positive phase, the pressure in the polar region decreases at 500 hPa; the pressure in East Asia increases anomalously; the East Asian trough decreases; and the low-level westerly jet moves northward, preventing the northwesterly cold air from moving southward. Therefore, the whole eastern China gets warmer and wetter air, and there are more light fog days with the enhanced water vapor. However, the atmosphere merely becomes more towards unstable in South China, where the precipitation increases but the heavy fog days decreases. Nevertheless, heavy fog days increase with the water vapor in North China because of moving towards a stable atmosphere, which is formed by the anomalous downdrafts north of the precipitation center in South China. When AO is in the negative phase, the situation is basically opposite to that in the positive phase, but the variations of the corresponding fog days and circulations are weaker than those in the AO-positive-phase winter, which may be related to the nonlinear effect of AO on climate.

Relationships between Water Vapor Path and Precipitation over the Tropical Oceans

2004 ◽  
Vol 17 (7) ◽  
pp. 1517-1528 ◽  
Author(s):  
Christopher S. Bretherton ◽  
Matthew E. Peters ◽  
Larissa E. Back
Keyword(s):  
Water Vapor ◽  
Tropical Oceans ◽  
Water Vapor Path

Retrieval of Slant Water Vapor Path and Slant Liquid Water from Microwave Radiometer Measurements during the DYNAMO Experiment

2015 ◽  
Vol 8 (9) ◽  
pp. 4315-4324 ◽  
Author(s):  
Swaroop Sahoo ◽  
Xavier Bosch-Lluis ◽  
Steven C. Reising ◽  
Scott M. Ellis ◽  
Jothiram Vivekanandan ◽  
...  
Keyword(s):  
Water Vapor ◽  
Liquid Water ◽  
Microwave Radiometer ◽  
Water Vapor Path

scholarly journals A Lagrangian Analysis of Water Vapor Sources and Pathways for Precipitation in East China in Different Stages of the East Asian Summer Monsoon

2020 ◽  
Vol 33 (3) ◽  
pp. 977-992 ◽  
Author(s):  
Yi Shi ◽  
Zhihong Jiang ◽  
Zhengyu Liu ◽  
Laurent Li
Keyword(s):  
Water Vapor ◽  
Summer Monsoon ◽  
East Asian Summer Monsoon ◽  
North China ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Seasonal Migration ◽  
East China ◽  
Terminal Stage ◽  
Asian Summer

AbstractThe Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) platform is used to simulate Lagrangian trajectories of air parcels in East China during the summer monsoon. The investigation includes four distinct stages of the East Asian summer monsoon (EASM) during its seasonal migration from south to north. Correspondingly, the main water vapor channel migrates from the west Pacific Ocean (PO) for the premonsoon in South China (SC) to the Indian Ocean (IO) for the monsoon in SC and in the Yangtze–Huaihe River basin, and finally back to the PO for the terminal stage of monsoon in North China. Further calculations permit us to determine water vapor source regions and water vapor contribution to precipitation in East China. To a large extent, moisture leading to precipitation does not come from the strongest water vapor pathways. For example, the proportions of trajectories from the IO are larger than 25% all of the time, but moisture contributions to actual precipitation are smaller than 10%. This can be explained by the large amount of water vapor lost in the pathways across moisture-losing areas such as the Indian and Indochina Peninsulas. Local water vapor recycling inside East China (EC) contributes significantly to regional precipitation, with contributions mostly over 30%, although the trajectory proportions from subregions in EC are all under 10%. This contribution rate can even exceed 55% for the terminal stage of the monsoon in North China. Such a result provides important guidance to understand the role of land surface conditions in modulating rainfall in North China.

Role of Tibetan Plateau in Northern Drought induced by Changes in Subtropical Westerly Jet

2021 ◽  
pp. 1-40
Author(s):  
Qingzhe Zhu ◽  
Yuzhi Liu ◽  
Tianbin Shao ◽  
Run Luo ◽  
Ziyuan Tan
Keyword(s):  
Water Vapor ◽  
Tibetan Plateau ◽  
North China ◽  
Lower Troposphere ◽  
Vapor Transport ◽  
Water Vapor Transport ◽  
The Tibetan Plateau ◽  
Westerly Jet ◽  
The Impact ◽  
Subtropical Westerly Jet

AbstractThe Tibetan Plateau (TP), the “Water Tower of Asia”, plays an important role in the water cycle. However, few studies have linked the TP’s water vapor supply with the climate over North China. In this study, we found that changes in the subtropical westerly jet (SWJ) dynamically induce drought in North China, and the TP plays an important role in this relationship. During July-August for the period of 1981-2019, the SWJ center between 75°E and 105°E obviously shifted northward at a rate of 0.04° per year. Correspondingly, the zonal winds in the southern subtropics were incredibly weakened, causing the outflow of water vapor from the TP to decrease dramatically. Combined with numerical simulations, we discovered that a reduction in water vapor transport from the TP can obviously decrease the precipitation over North China. Sensitivity experiments demonstrated that if the water vapor outflow from the eastern border of the TP decreases by 52.74%, the precipitation in North China will decrease by 12.69% due to a decrease in the local cloud fraction caused by a diminished water vapor content in the atmosphere. Therefore, although less water vapor transport occurs in the upper troposphere than in the lower troposphere, the impact of transport from the TP in the former on the downstream precipitation cannot be ignored.

scholarly journals Trends and Variability in Precipitable Water Vapor throughout North China from 1979 to 2015

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Wang Peng ◽  
Xie Tongchuan ◽  
Dai Jiageng ◽  
Sun Jingmin ◽  
Wu Yanling ◽  
...  
Keyword(s):  
Water Vapor ◽  
Inner Mongolia ◽  
North China ◽  
Eastern China ◽  
Precipitable Water ◽  
Precipitable Water Vapor ◽  
Qinghai Province ◽  
Trend Magnitude ◽  
Four Seasons ◽  
Increasing Trends

This study analyzed the variability and trends in precipitable water vapor (PWV) in North China from 1979 to 2015. The spatial distribution of annual mean PWV was generally characterized by two high PWV centers in Eastern China and the Tarim Basin and two low PWV centers in Northern Tibet and Qinghai Province and in Inner Mongolia. The levels of seasonal mean PWV were highest in summer, followed by autumn and spring, and lowest in winter. The maximum monthly mean PWV occurred in July and August, while the minimum occurred in December to February. Increasing trends in PWV, with the trend magnitude ranging from 0.1 to 1.2 mm decade−1 over North China, were observed in the radiosonde, ERA-interim, and MERRA-2 PWV data from 1979 to 1999; but a slightly decreasing trend of −0.4 mm decade−1 from radiosonde was found in most regions of North China from 1979 to 2007. A monotonically increasing PWV trend was detected throughout North China between 1979 and 1999, with the maximum trend occurring in summer and the minimum occurring in winter. For the period of 1979–2007, a slightly but less marked decreasing trend was found at most stations in North China in all four seasons.

scholarly journals Different Roles of Water Vapor Transport and Cold Advection in the Intensive Snowfall Events over North China and the Yangtze River Valley

Atmosphere ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 368 ◽  
Author(s):  
Zhixing Xie ◽  
Bo Sun
Keyword(s):  
Water Vapor ◽  
Yangtze River ◽  
North China ◽  
Dominant Role ◽  
Eastern China ◽  
Yangtze River Valley ◽  
River Valley ◽  
Vapor Transport ◽  
Water Vapor Transport

Intensive snowfall events (ISEs) have a profound impact on the society and economy in China during winter. Considering that the interaction between northerly cold advection and southerly water vapor transport (WVT) is generally an essential condition for the occurrence of ISEs in eastern China, this study investigates the different roles of anomalous southerly WVT and northerly cold advection during the ISEs in the North China (NC) and Yangtze River valley (YRV) regions based on a composite analysis of seventy ISE cases in NC and forty ISE cases in the YRV region from 1961 to 2014. The results indicate that the ISEs in NC are mainly associated with a significant pre-conditioning of water vapor over NC induced by southerly WVT anomalies over eastern China, whereas the ISEs in the YRV region are mainly associated with a strengthened Siberian High (SH) and strong northerly cold advection invading the YRV region. These results suggest a dominant role of anomalous southerly WVT in triggering the ISEs in NC and a dominant role of northerly cold advection in triggering the ISEs in the YRV region. The different roles of anomalous southerly WVT and northerly cold advection in the ISEs over the NC and YRV regions are largely attributed to the different winter climate in the NC and YRV regions—during winter, the NC (YRV) region is dominated by cold and dry (relatively warm and moist) air flow and hence southerly WVT (northerly cold advection) is the key factor for triggering the ISEs in NC (the YRV region).

An improved, near real time water vapor path delay correction of Cryosat-2 sea surface height measurements

2014 ◽  
Vol 54 (6) ◽  
pp. 1035-1043
Author(s):  
J. Stum ◽  
A. Delepoulle ◽  
P. Sicard ◽  
A. Guillot ◽  
T. Guinle
Keyword(s):  
Water Vapor ◽  
Real Time ◽  
Sea Surface Height ◽  
Sea Surface ◽  
Path Delay ◽  
Water Vapor Path ◽  
Delay Correction
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