@ The University of Oklahoma

Month: December 2022

New paper on moisture sources of precipitation in the Tibetan Plateau published in Hydrology and Earth System Sciences

Our new paper, “Spatial distribution of oceanic moisture contributions to precipitation over the Tibetan Plateau“, is published in Hydrology and Earth System Sciences (IF: 6.617).

The paper and its supplement can be downloaded at https://hess.copernicus.org/articles/26/6413/2022/.

Authors: Ying Li, Chenghao Wang, Ru Huang, Denghua Yan, Hui Peng, and Shangbin Xiao

Abstract: Evaporation from global oceans is an important moisture source for glaciers and headwaters of major Asian rivers in the Tibetan Plateau (TP). Although the accelerated global hydrological cycle, the altered sea–land thermal contrast and the amplified warming rate over the TP during the past several decades are known to have profound effects on the regional water balance, the spatial distribution of oceanic moisture contributions to the vast TP remains unclear. This hinders the accurate quantification of regional water budgets and the reasonable interpretation of water isotope records from observations and paleo archives. Based on historical data and moisture tracking, this study systematically quantifies the absolute and relative contributions of oceanic moisture to long-term precipitation in the TP. Results show that the seasonal absolute and relative oceanic contributions are generally out of phase, revealing the previously underestimated oceanic moisture contributions brought by the westerlies in winter and the overestimated moisture contributions from the Indian Ocean in summer. Quantitatively, the relative contribution of moisture from the Indian Ocean is only ∼30 % in the south TP and further decreases to below 10 % in the northernmost TP. The absolute oceanic contribution exhibits a spatial pattern consistent with the dipole pattern of long-term precipitation trends across the Brahmaputra Canyon region and the central-northern TP. In comparison, relative oceanic contributions show strong seasonal patterns associated with the seasonality of precipitation isotopes across the TP.

DOI: https://doi.org/10.5194/hess-26-6413-2022

Fig. 8. Locations of the precipitation isotope monitoring stations and the relationship between the monthly relative IO moisture contributions (blue lines) and the precipitation isotope observations (dotted lines). Sites 1–13, 14–17 and 18–19 represent stations located within the monsoon domain, transition domain and westerlies domain, respectively. Blue lines show the mean IO moisture contributions based on three simulations, while the shadings show the range (detailed seasonal variations of three simulations are shown in Fig. S14). Note that for consistency, oceanic contributions below 10% and above 50% are not shown for sites 12 and 18.

Upcoming presentations at AGU Fall Meeting 2022

Come to our presentations at AGU Fall Meeting in Chicago!

GC15D-04: Heterogeneous Response of City-level Building Energy Use to Future Climate Change, Socioeconomic Development, and Power Sector Decarbonization

Time: 3:20 pm – 3:30 pm, Monday, Dec 12, 2022

Room: McCormick Place – S504abc (South, Level 5)

Presenter: Chenghao Wang

Session: GC15D: Multi-sector Dynamics: Environmental Change, Resilience, and Society in Urban Areas Under a Changing Climate II Oral

Abstract Link: https://agu.confex.com/agu/fm22/meetingapp.cgi/Paper/1083474

NG25B-0390 – Finding Causal Gateways of Heatwave Propagation among U.S. Cities

Time: 2:45 pm – 6:15 pm, Tuesday, Dec 13, 2022

Room: McCormick Place – Poster Hall‚ Hall A, Board 0390

Presenter: Xueli Yang

Session: NG25B: Extreme Variability and Complexity: Bridging Mathematics, Physics, and Information Technologies from Urban Systems to Climate, Geophysics, and Pandemics III Poster

Abstract Link: https://agu.confex.com/agu/fm22/meetingapp.cgi/Paper/1060203

GC36D-08 – A Single-Layer Urban Canopy Model with Transmissive Radiation Exchange between Trees and Street Canyons

Time: 6:04 pm – 6:15 pm, Wednesday, Dec 14, 2022

Room: McCormick Place – S502ab (South, Level 4)

Presenter: Chenghao Wang

Session: GC36D: Urban Areas and Global Change III Oral

Abstract Link: https://agu.confex.com/agu/fm22/meetingapp.cgi/Paper/1084322

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