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您的检索式：作者名="Clemens Simmer"
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| 1 | PARSIVEL Snow Observations: A Critical Assessment显示文摘 | Tokay Ali Blahak Ulrich Simmer Clemens | 2010 | Journal of Atmospheric and Oceanic Technology2010，，2： | 1 |
| 2 | Regional dynamical downscaling with CCLM over East Asia显示文摘 | Dinan Wang Christoph Menz Thorsten Simon Clemens Simmer Christian Ohlwein | 2013 | Meteorology and Atmospheric Physics2013，，1： | 1 |
| 3 | Changing structure of European precipitation: Longer wet periods leading to more abundant rainfalls显示文摘 | Zolina Olga Simmer Clemens Gulev Sergey K. Kollet Stefan | 2010 | Geophysical Research Letters2010，，6： | 1 |
| 4 | The Simulation of L-Band Microwave Emission of Frozen Soil during the Thawing Period with the Community Microwave Emission Model(CMEM)显示文摘One-third of the Earth’s land surface experiences seasonal freezing and thawing.Freezing-thawing transitions strongly impact land-atmosphere interactions and,thus,also the lower atmosphere above such areas.Observations of two L-band satellites,the Soil Moisture Active Passive(SMAP)and Soil Moisture and Ocean Salinity(SMOS)missions,provide flags that characterize surfaces as either frozen or not frozen.However,both state transitions—freezing and thawing(FT)—are continuous and complex processes in space and time.Especially in the L-band,which has penetration depths of up to tens of centimeters,the brightness temperature(T_(B))may be generated by a vertically-mixed profile of different FT states,which cannot be described by the current version of the Community Microwave Emission Model(CMEM).To model such complex state transitions,we extended CMEM in Fresnel mode with an FT component by allowing for(1)a varying fraction of an open water surface on top of the soil,and(2)by implementing a temporal FT phase transition delay based on the difference between the soil surface temperature and the soil temperature at 2.5 cm depth.The extended CMEM(CMEM-FT)can capture the T_(B)progression from a completely frozen to a thawed state of the contributing layer as observed by the L-band microwave radiometer ELBARA-III installed at the Maqu station at the northeastern margin of the Tibetan Plateau.The extended model improves the correlation between the observations and CMEM simulations from 0.53/0.45 to 0.85/0.85 and its root-mean-square-error from 32/25 K to 20/15 K for H/V-polarization during thawing conditions.Yet,CMEM-FT does still not simulate the freezing transition sufficiently. | Shaoning Lv Clemens Simmer Yijian Zeng Jun Wen and Zhongbo Su | 2022 | Journal of Remote Sensing2022，，1： | 0 |
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