Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD029673 |
Global Assimilation of Loon Stratospheric Balloon Observations | |
Coy, L.1,2; Schoeberl, M. R.3; Pawson, S.1; Candido, S.4; Carver, R. W.4 | |
2019-03-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:6页码:3005-3019 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Accurate analyses of stratospheric winds are important for determining realistic constituent transport and providing improved diagnostic studies and forecasts of the stratosphere. This study examines impacts on global meteorological analyses resulting from using winds derived from Loon superpressure balloons in the lower stratosphere (hereafter Loon winds) as additional input observations to the Goddard Earth Observing System (GEOS) data assimilation system. To fully investigate the impacts of assimilating the Loon winds, two steps are taken: (1) comparison of the GEOS analysis winds with Loon winds (Control experiment) and (2) examination of the impacts of assimilating the Loon winds into the GEOS data assimilation system (Loon experiment). The time period selected is June-August 2014 when over 150 Loon balloons were launched, mainly in the Southern Hemisphere. In the middle latitudes, the Loon winds and Control winds agree well (Loon balloon zonal wind observation minus forecast, O-F, root-mean-square (RMS) values of similar to 2.75 m/s) and assimilating the Loon winds has a small impact (O-F RMS values unchanged). In the tropics, the Loon observations and Control analysis winds differ more than in middle latitudes (zonal wind O-F RMS similar to 3.75 m/s) and assimilating the Loon winds improves the zonal wind O-F RMS by similar to 1m/s. In selected cases where the Loon observations and Control analysis differ greatly (O-F RMS values greater than 10m/s), assimilating Loon winds significantly decreases the zonal wind O-F RMS by 5m/s. These decreases in O-F RMS values show that the 6-hr forecasts are improved at the Loon balloon observation locations. Plain Language Summary While satellites routinely measure Earth's global temperatures from space, in situ wind measurements are relatively scarce, consisting mainly of a network of ground-based weather balloons. Since only a limited number of the weather balloons even reach stratospheric altitudes, there is a need for additional stratospheric observations. One option for addition wind information is the use of experimental superpressure balloons (SPBs). SPBs can remain in the stratosphere for many months traveling with the winds and hence, by reporting their changing positions, providing in situ wind observations. These SPBs experiments are generally limited in terms of time period and number of balloons. However, over the past few years Loon has been launching hundreds of SPBs (hereafter called Loon balloons) providing a more consistent set of observations of wind in the stratosphere. Here we assimilate some of the Loon balloon winds into the NASA GEOS global data assimilation system. The data assimilation system combines all observations with an atmospheric model to produce global analysis of winds and temperatures. Results show that including the Loon balloon wind information noticeably affects the global analysis as well as forecasts with the largest impact in the tropics. These results provide direction to future model and analysis improvements. |
英文关键词 | stratosphere data assimilation balloons wind assimilation tropics |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464653500010 |
WOS关键词 | WAVE MOMENTUM FLUX ; PHASE SPEEDS ; PART I ; FLIGHTS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/181710 |
专题 | 气候变化 |
作者单位 | 1.NASA, Global Modeling & Assimilat Off, GSFC, Greenbelt, MD 20771 USA; 2.SSAI, Lanham, MD 20706 USA; 3.STC, Columbia, MD USA; 4.Loon, Mountain View, CA USA |
推荐引用方式 GB/T 7714 | Coy, L.,Schoeberl, M. R.,Pawson, S.,et al. Global Assimilation of Loon Stratospheric Balloon Observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(6):3005-3019. |
APA | Coy, L.,Schoeberl, M. R.,Pawson, S.,Candido, S.,&Carver, R. W..(2019).Global Assimilation of Loon Stratospheric Balloon Observations.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(6),3005-3019. |
MLA | Coy, L.,et al."Global Assimilation of Loon Stratospheric Balloon Observations".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.6(2019):3005-3019. |
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