Diurnal Variation Characteristics of Rainfall in the Three-River-Headwater Region of the Tibetan Plateau in Summer

2022 ◽  
Author(s):  
Shujing Shen ◽  
Hui Xiao ◽  
Huiling Yang ◽  
Danhong Fu ◽  
Weixi Shu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Diurnal Variation ◽  
The Tibetan Plateau ◽  
Variation Characteristics

scholarly journals Comprehensive Characteristics of Summer Deep Convection over Tibetan Plateau and Its South Slope from the Global Precipitation Measurement Core Observatory

Atmosphere ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 9 ◽  
Author(s):  
Guolu Gao ◽  
Quanliang Chen ◽  
Hongke Cai ◽  
Yang Li ◽  
Zhenglin Wang
Keyword(s):  
Tibetan Plateau ◽  
Diurnal Variation ◽  
Vertical Structure ◽  
Deep Convection ◽  
Low Frequency ◽  
The Tibetan Plateau ◽  
Precipitation Measurement ◽  
South Slope ◽  
Global Precipitation Measurement ◽  
Global Precipitation

Observational data from the Global Precipitation Measurement (GPM) Core Observatory during four summers (2014–2017) has been used to investigate deep convection systems (DCSs) over the Tibetan Plateau (TP) and its south slope (SS). The frequency, geographical distribution diurnal variation, and vertical structure of DCSs over the TP and SS are compared among these two regions. The frequency of DCSs over the SS (0.98%) was far higher than over the TP (0.15%), suggesting that stronger DCSs occur to the east and south of the TP. The maximum number of DCS occurred in July and August. A clear diurnal variation in DCS was found over the whole region, DCSs over the TP and SS both have a greatest amplitude in the afternoon. The probability of DCSs from 1200 to 1800 local time (LT) was 76.3% and 44.1% over TP and SS respectively, whereas the probability of DCSs being generated from 2200 (LT) to 0600 on the next day LT was 0.03% and 33.1% over the TP and SS respectively. There was a very low frequency of DCSs over the TP during the night. Five special echo top heights were used to investigate the vertical structure of DCSs. DCSs over the TP were both weaker and smaller than those over the SS.

scholarly journals Spatio-Temporal Variation of Reference Evapotranspiration and Its Climatic Drivers over the Tibetan Plateau during 1970–2018

2021 ◽  
Vol 11 (17) ◽  
pp. 8013
Author(s):  
Shanshan Hu ◽  
Ruyi Gao ◽  
Tao Zhang ◽  
Peng Bai ◽  
Rui Zhang
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Tibetan Plateau ◽  
Reference Evapotranspiration ◽  
Climatic Factors ◽  
Kendall Test ◽  
The Tibetan Plateau ◽  
Variation Characteristics ◽  
Climatic Drivers ◽  
Spatio Temporal

Reference evapotranspiration (ET0) is a key component of hydrologic cycle and it is important for water resources management. Analysis of ET0 changes is particularly critical for understanding the impacts of climatic change on hydrology in ecologically fragile regions. In this study, using the Penman–Monteith method and the Mann–Kendall test, the variation characteristics of ET0 on the Tibetan Plateau (TP) from 1970 to 2018 was analyzed, and the dominant climatic factors controlling the change of ET0 was also explored. The result shows that in TP region: (1) there was an abrupt change in the trend of ET0 around 1997, and the ET0 declined at a rate of −25.9 mm/decade during 1970–1996 but increased by 31.1 mm/decade during 1997–2018; (2) ET0 is most sensitive to solar radiation, then relative humidity, wind speed and mean temperature; (3) the decrease of ET0 before 1997 was mainly due to the decline of wind speed and the increase of relative humidity, while the increase of ET0 after 1997 was mainly due to the decrease of relative humidity. The results of this study can provide data reference for the research of water balance on the TP.

scholarly journals Variations of surface roughness on inhomogeneous underlying surface at Nagqu Area over the Tibetan Plateau

2020 ◽  
Author(s):  
Maoshan Li ◽  
Lei Shu ◽  
Xiaoran Liu ◽  
Shucheng Yin ◽  
Lingzhi Wang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Tibetan Plateau ◽  
Satellite Data ◽  
Underlying Surface ◽  
Surface Model ◽  
Model Parameters ◽  
Observation Data ◽  
The Tibetan Plateau ◽  
Northern Tibetan Plateau ◽  
Variation Characteristics

Abstract. Using the MODIS satellite data and station atmospheric turbulence observation data in Nagqu area of northern Tibetan plateau in 2008, 2010 and 2012, with the Massman retrieved model and an independent method to determine aerodynamic surface roughness, the temporal and spatial variation characteristics of the surface roughness was analyzed. The results show that the surface roughness has obvious seasonal variation characteristics. From February to August, Z0m increases constantly with the ablation of snow and vegetation growth, and the maximum value reaches 4–5 cm at BJ site. From September to February, Z0m gradually decreased because of the post-monsoon over the plateau, and the values decreased to about 1–2 cm. The snowfall in abnormal years is the main reason why Z0m is obviously lower than that in normal. The underlying surface can be divided into four categories according to the different values of Z0m: snow and ice, sparse grassland, lush grassland and town. Among them, lush grassland and sparse grassland account for 62.49 % and 33.74 % respectively in the region, which are the main categories, and their Z0m annual changes are between 2–6 cm and 1–4 cm. The correlation between the two methods are positively related to each other, and the retrieved data are smaller than the measured results due to the average sliding action. On the whole, Z0m calculated by satellite data retrieved algorithm is feasible, it can be applied to improve the model parameters of land surface model parameters and the accuracy of model simulation, better reveal the heat flux exchange.

scholarly journals Spatial and Temporal Characteristics of Cirrus Clouds over the Tibetan Plateau Based on CALIPSO and AIRS Observations

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Hailei Liu ◽  
Yuan Chen ◽  
Shenglan Zhang ◽  
Jilie Ding ◽  
Xiaobo Deng ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Deep Convection ◽  
Temporal Distribution ◽  
Cirrus Clouds ◽  
The Tibetan Plateau ◽  
Atmospheric Infrared Sounder ◽  
Ice Clouds ◽  
Latitude Belt ◽  
Variation Characteristics ◽  
High Clouds

The spatial and temporal distribution characteristics of high clouds over the Tibetan Plateau (TP) were studied using the Atmospheric Infrared Sounder (AIRS) and the GCM-Oriented CALIPSO Cloud Product (CALIPSO-GOCCP) monthly mean cloud products from 2007 to 2017. The high clouds over the TP are dominated by cirrus and show seasonal variation characteristics. There were two distinct areas with the high occurrence of cirrus clouds in the area (0°–60°N, 75°–103°E). One was located in the regions from the equator to 25°N, and the other was within the latitude belt from 30° to 40°N. From January to May, cirrus clouds mainly occurred in the central and northern parts of the TP (30° to 40°N), and the cirrus cloud fraction increased from January and reached its maximum (∼0.51) in April. From June to August, cirrus clouds mainly occurred in the southern part of the TP during summer. The cirrus clouds over the southern TP were relatively high (located in 10–17 km) and manifested northward and southward movements. The ice clouds in the southern TP are associated with plateau deep convection activities and abundant vapor transmitted by the Asian monsoon. Cirrus clouds over the northern and central TP may be relevant to the atmospheric lift by an approaching cold front and topographic lifting. Moreover, the high clouds below 11 km are dominated by opaque clouds, while the nonopaque (or thin) and opaque (or thick) clouds above 11 km are comparable.

The diurnal variation of precipitation in monsoon season in the Tibetan Plateau

2002 ◽  
Vol 19 (2) ◽  
pp. 365-378 ◽  
Author(s):  
Liu Liping ◽  
Feng Jinming ◽  
Chu Rongzhong ◽  
Zhou Yunjun ◽  
K. Ueno
Keyword(s):  
Tibetan Plateau ◽  
Diurnal Variation ◽  
Monsoon Season ◽  
The Tibetan Plateau

scholarly journals Diurnal variation of summer precipitation over the Tibetan Plateau: a cloud-resolving simulation

2012 ◽  
Vol 30 (11) ◽  
pp. 1575-1586 ◽  
Author(s):  
◽  
◽  
◽  
Keyword(s):  
Tibetan Plateau ◽  
Diurnal Variation ◽  
Summer Precipitation ◽  
Weather Research And Forecasting ◽  
The Tibetan Plateau ◽  
Good Correspondence ◽  
Diurnal Cycles ◽  
Regional Circulation ◽  
Trmm Precipitation ◽  
Diurnal Rainfall

Abstract. In this study, the Weather Research and Forecasting model was used to simulate the diurnal variation in summer precipitation over the Tibetan Plateau (TP) at a cloud-resolving scale. Compared with the TRMM, precipitation data shows that the model can well simulate the diurnal rainfall cycle with an overall late-afternoon maximum precipitation in the central TP and a nighttime maximum in the southern edge. The simulated diurnal variations in regional circulation and thermodynamics are in good correspondence with the precipitation diurnal cycles in the central and southern edge of TP, respectively. A possible mechanism responsible for the nocturnal precipitation maximum in the southern edge has been proposed, indicating the importance of the TP in regulating the regional circulation and precipitation.

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