Zhang, Yixiao and Qiu, Yubao and Peng, Chongtai and Cheng, Bin and Shi, Lijuan and Leppäranta, Matti (2024) Brightness temperature simulation of subarctic lake-ice evolution by HIGHTSI and SMRT model. Advances in Polar Science, 35 (3). pp. 303-323.
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Abstract
Microwave brightness temperature (TB) can be used to retrieve lake ice thickness in the Arctic and subarctic regions. However, the accuracy of the retrieval is affected by the physical properties of lake ice. To improve the understanding of how lake ice affects TB, numerical modeling was applied. This study combined a physical thermodynamic ice model HIGHTSI with a microwave radiation transfer model SMRT to simulate the TB and lake ice evolution in 2002–2011 in Hulun Lake, China. The reanalyzed meteorological data were used as atmospheric forcing. The ice season was divided into the growth period, the slow growth period, and the ablation period. The simulations revealed that TB was highly sensitive to ice thickness during the ice season, especially vertical polarization measurement at 18.7 GHz. The quadratic polynomial fit for ice thickness to TB outperformed the linear fit, regardless of whether lake ice contained bubbles or not. A comparison of the simulated TB with space-borne TB showed that the simulated TB had the best accuracy during the slow growth period, with a minimum RMSE of 4.6 K. The results were influenced by the bubble radius and salinity. These findings enhance comprehension of the interaction between lake ice properties (including ice thickness, bubbles, and salinity) and TB during ice seasons, offering insights to sea ice in the Arctic and subarctic freshwater observations.
| Item Type: | Article |
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| Related URLs: | |
| Keywords: | lake ice evolution, HIGHTSI, SMRT, ice thickness, passive microwave brightness temperature |
| Subjects: | Natural Environment > Atmosphere Natural Environment > Cryosphere Natural Environment > Oceans |
| Organizations: | Unspecified |
| Date Deposited: | 06 Jan 2025 09:51 |
| URI: | http://library.arcticportal.org/id/eprint/2850 |
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