Tropical Cyclones in the 7km NASA Global Nature Run for use in Observing System Simulation Experiments
| Autor: | Oreste Reale, Deepthi Achuthavarier, Gary Partyka, William M. Putman, Marangelly Fuentes |
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| Rok vydání: | 2018 |
| Předmět: |
Atmospheric Science
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Atmospheric circulation Tropical wave Ocean Engineering Structural basin Tropical Atlantic 010502 geochemistry & geophysics Monsoon Atmospheric sciences 01 natural sciences Article Data assimilation Climatology Sea ice Environmental science Tropical cyclone 0105 earth and related environmental sciences |
| Zdroj: | Journal of atmospheric and oceanic technology. 34(No 1) |
| ISSN: | 0739-0572 |
| Popis: | The National Aeronautics and Space Administration (NASA) nature run (NR), released for use in observing system simulation experiments (OSSEs), is a 2-yr-long global nonhydrostatic free-running simulation at a horizontal resolution of 7 km, forced by observed sea surface temperatures (SSTs) and sea ice, and inclusive of interactive aerosols and trace gases. This article evaluates the NR with respect to tropical cyclone (TC) activity. It is emphasized that to serve as an NR, a long-term simulation must be able to produce realistic TCs, which arise out of realistic large-scale forcings. The presence in the NR of the relevant dynamical features over the African monsoon region and the tropical Atlantic is confirmed, along with realistic African easterly wave activity. The NR Atlantic TC seasons, produced with 2005 and 2006 SSTs, show interannual variability consistent with observations, with much stronger activity in 2005. An investigation of TC activity over all the other basins (eastern and western North Pacific Ocean, north and south Indian Ocean, and Australian region), together with important elements of the atmospheric circulation, such as the Somali jet and westerly bursts, reveals that the model captures the fundamental aspects of TC seasons in every basin, producing a realistic number of TCs with realistic tracks, life spans, and structures. This confirms that the NASA NR is a very suitable tool for OSSEs targeting TCs and represents an improvement with respect to previous long simulations that have served the global atmospheric OSSE community. |
| Databáze: | OpenAIRE |
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