Universität zu Köln

Cao, Bangjun ORCID: 0000-0003-1166-004X, Yang, Xianyu, Li, Boliang, Lu, Yaqiong and Wen, Jun ORCID: 0000-0003-1146-3628 (2022). Diurnal Variation in Cloud and Precipitation Characteristics in Summer over the Tibetan Plateau and Sichuan Basin. Remote Sens., 14 (11). BASEL: MDPI. ISSN 2072-4292

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Abstract

The diurnal variation in precipitation and cloud parameters and their influencing factors during summer over the Tibetan Plateau (TP) and Sichuan Basin (SB) were investigated using the Hydro-Estimator satellite rainfall estimates, ground observations, and ERA5 dataset. The precipitation and cloud parameters show diurnal propagation over the SB during the mei-yu period in contrast to such parameters over the TP. The diurnal maximum precipitation from the Hydro-Estimator satellite and cloud ice and liquid water content (cloud LWC and IWC) from the ERA5 dataset are concentrated in the early evening, while their diurnal minimums manifest in the morning. Cloud LWC accounts for more than 60% of the total water during almost the entire diurnal cycle over the inner TP and SB during the mei-yu period. The IWC accounts for more than 60% of the total water in the late afternoon over the edge of the SB and TP. The cloud base height (CBH) above ground level (AGL), the lifting condensation level (LCL) AGL, and the zero degree level AGL are almost equal over the TP during the summer period. The zero degree level AGL over the SB is higher than that over the TP because the air temperature lapse rate over the TP is larger. The thickness of liquid water cloud over the SB is larger than that over the TP. The correlation analysis shows that the CBH AGL and LCL AGL over the TP are related to the dewpoint spread, but less so over the SB because of the stronger turbulence and lower air density over the TP than the SB. Convective available potential energy has a larger impact on precipitation over the TP than the SB. The cloud LWC makes a larger contribution to the precipitation over the SB than over the TP, which is related to the mean zonal wind and diurnal cycle of low-level winds. The precipitation at the edge of the TP and SB (i.e., the steep downstream slope) is largely influenced by the ice water contained within clouds owing to the convergence rising motion over the slopes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Cao, Bangjun UNSPECIFIED orcid.org/0000-0003-1166-004X UNSPECIFIED Yang, Xianyu UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Boliang UNSPECIFIED UNSPECIFIED UNSPECIFIED Lu, Yaqiong UNSPECIFIED UNSPECIFIED UNSPECIFIED Wen, Jun UNSPECIFIED orcid.org/0000-0003-1146-3628 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-676368
DOI:	10.3390/rs14112711
Journal or Publication Title:	Remote Sens.
Volume:	14
Number:	11
Date:	2022
Publisher:	MDPI
Place of Publication:	BASEL
ISSN:	2072-4292
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MONSOON; CONVECTION; EAST; MICROWAVE; SEASON; LEVEL; CHINA Multiple languages Environmental Sciences; Geosciences, Multidisciplinary; Remote Sensing; Imaging Science & Photographic Technology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67636