This study evaluates the impact of atmospheric observations from the Tropospheric Airborne Meteorological Data Reporting (TAMDAR) observing system on numerical weather prediction of hurricane Ike (2008) using three-di...This study evaluates the impact of atmospheric observations from the Tropospheric Airborne Meteorological Data Reporting (TAMDAR) observing system on numerical weather prediction of hurricane Ike (2008) using three-dimensional data assimilation system for the Weather Research and Forecast (WRF) model (WRF 3D-Var). The TAMDAR data assimilation capability is added to WRF 3D-Var by incorporating the TAMDAR observation operator and corresponding observation processing procedure. Two 6-h cycling data assimilation and forecast experiments are conducted. Track and intensity forecasts are verified against the best track data from the National Hurricane Center. The results show that, on average, assimilating TAMDAR observations has a positive impact on the forecasts of hurricane Ike. The TAMDAR data assimilation reduces the track errors by about 30 km for 72-h forecasts. Improvements in intensity forecasts are also seen after four 6-h data assimilation cycles. Diagnostics show that assimilation of TAMDAR data improves subtropical ridge and steering flow in regions along Ike's track, resulting in better forecasts.展开更多
China＇s ＂Belt and Road＂ initiative is emerging as the Western-dominated world order is declining. Capitalism has intensified the rich-poor divide and power politics have led to great upheavals. Western values have ...China＇s ＂Belt and Road＂ initiative is emerging as the Western-dominated world order is declining. Capitalism has intensified the rich-poor divide and power politics have led to great upheavals. Western values have caused a ＂value dislocation＂ for non-Western countries. The world is calling for new development concepts. The ＂Belt and Road＂ initiative has emerged as an answer. It embodies China＇s ideas on global development. First, it works for the ＂common prosperity＂ of every country, which will ease contradictions between the South and the North. Second, it emphasizes geo-economie integration that will heal the fragmentation of Eurasia. Third, it advocates linkages between people and inclusiveness to create a new kind of civilization. However, many difficulties and challenges lie ahead for the implementation of the ＂Belt and Road＂ initiative.展开更多
基金funded by the Air Dat projectThe National Center for Atmospheric Research is sponsored by the National Science Foundation
文摘This study evaluates the impact of atmospheric observations from the Tropospheric Airborne Meteorological Data Reporting (TAMDAR) observing system on numerical weather prediction of hurricane Ike (2008) using three-dimensional data assimilation system for the Weather Research and Forecast (WRF) model (WRF 3D-Var). The TAMDAR data assimilation capability is added to WRF 3D-Var by incorporating the TAMDAR observation operator and corresponding observation processing procedure. Two 6-h cycling data assimilation and forecast experiments are conducted. Track and intensity forecasts are verified against the best track data from the National Hurricane Center. The results show that, on average, assimilating TAMDAR observations has a positive impact on the forecasts of hurricane Ike. The TAMDAR data assimilation reduces the track errors by about 30 km for 72-h forecasts. Improvements in intensity forecasts are also seen after four 6-h data assimilation cycles. Diagnostics show that assimilation of TAMDAR data improves subtropical ridge and steering flow in regions along Ike's track, resulting in better forecasts.
文摘China＇s ＂Belt and Road＂ initiative is emerging as the Western-dominated world order is declining. Capitalism has intensified the rich-poor divide and power politics have led to great upheavals. Western values have caused a ＂value dislocation＂ for non-Western countries. The world is calling for new development concepts. The ＂Belt and Road＂ initiative has emerged as an answer. It embodies China＇s ideas on global development. First, it works for the ＂common prosperity＂ of every country, which will ease contradictions between the South and the North. Second, it emphasizes geo-economie integration that will heal the fragmentation of Eurasia. Third, it advocates linkages between people and inclusiveness to create a new kind of civilization. However, many difficulties and challenges lie ahead for the implementation of the ＂Belt and Road＂ initiative.
