20.500.12556/RUL-161049 Inferring atmospheric dynamics from aerosol observations in 4D-Var The paper explores the potential of aerosol observations to provide wind information in four-dimensional variational data assimilation (4D-Var). It is shown that the relative horizontal gradients, crucial for the wind extraction from tracers, are on average greater for the aerosol mixing ratio than for the specific humidity, whose observations are known to provide significant information on the wind field. The aerosols potential to infer atmospheric dynamics is investigated in the tropics where the wind information is most critical. An intermediate-complexity incremental 4D-Var system MADDAM has been developed with a forecast model that simulates most dominant processes involving moisture, aerosols and dynamics: the nonlinear advection, condensation andwet deposition. The results of 4D-Var experiments reveal a detrimental impact of saturation-related nonlinearities and aerosol wet deposition on the extraction of wind from aerosol data. The fraternal-twin experiments show about 30% smaller impact of the aerosol data on the wind analysis compared to humidity data, mainly due to the greater aerosol observation error and suboptimal background-error covariance model. However, the assimilation of aerosol data together with temperature and humidity observations shows a significant added value for the wind analyses. meteorology atmospheric physics aerosols 4D-Var wind humidity data assimilation meteorologija atmosferska fizika aerosoli 4D-var veter vlažnost zraka asimilacija podatkov true false true Angleški jezik Slovenski jezik Članek v reviji 2024-09-06 11:17:25 2024-09-06 11:17:25 2025-08-08 13:33:36 0000-00-00 00:00:00 2020 0 0 Str. 1403-1422 iss. 728 Vol. 146 2020 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 2020-02-18 551.501 0035-9009 10.1002/qj.3743 387497 Zaplotnik.pdf Zaplotnik.pdf 1 13B116946FC82F9FB86E7E91B461BD23 ac784cabc841b85bb5178e343a1f76a06c1a608a252d0fdba49257f92b2b895a 37431ceb-6c31-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=189906 https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/qj.3743 0 62d676bd-6c31-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=189907 Fakulteta za matematiko in fiziko 0 0 0