Based on the observation from a flux site over alpine meadow near Ngoring Lake, the surface energy flux balance status was studied in frozen periods from 2011 to 2013.The snow-covered period is defined as the observed surface albedo greater than 0.4.The Bowen-ratio in no-snow period was usually more than 3, while in the snow-covered periods less than 0.5.The soil heat storage was mainly focused in this study.The total mass of water in soil (liquid and solid form) was assumed to be changed little during the frozen period based on observation fact.The soil heat storage was contributed by two kinds of process.The first is due to the change in soil temperature, and the second is due to free-thaw cycle within soil.In no-snow period, the soil heat storage rates due to temperature change and freeze-thaw cycle have contributed 69% and 12% of the unbalanced surface energy fluxes, respectively.The ratio between these two kinds of heat storage depend on the cloudiness.The free-thaw cycle was more significant in a clear day than in a cloudy day.The closure ratio will increase a little when take both two kinds of process into consideration.While during the snow-covered periods, the heat storage in snow layer accounted for 88%, while the soil heat storage only accounted for nearly 10% of the unclosed energy fluxes.The ratio of heat storage between in soil and snow also changed with cloudiness.The heat storage in snow was more dominant in a clear day than in a cloudy day.
Murong QI
,
Qianhui MA
,
Qinghua YANG
,
Renhao WU
,
Shihua Lü
,
Xianhong MENG
,
Zhaoguo LI
,
Yinhuan AO
,
Bo HAN
. Analysis of Surface Heat Storage in Frozen Periods of Qinghai-Xizang Plateau——Take the Study of the Grassland near Ngoring Lake for Example[J]. Plateau Meteorology, 2020
, 39(6)
: 1270
-1281
.
DOI: 10.7522/j.issn.1000-0534.2019.00134
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