Preprints
https://doi.org/10.5194/amt-2019-379
https://doi.org/10.5194/amt-2019-379
30 Oct 2019
 | 30 Oct 2019
Status: this preprint was under review for the journal AMT but the revision was not accepted.

Comparison of RO tropopause height based on different tropopause determination methods

Ziyan Liu, Weihua Bai, Yueqiang Sun, Junming Xia, Guangyuan Tan, Cheng Cheng, Qifei Du, Xianyi Wang, Danyang Zhao, Yusen Tian, Xiangguang Meng, Congliang Liu, Yuerong Cai, and Dongwei Wang

Abstract. Tropopause region is a significant layer among the earth's atmosphere, receiving increasing attention from atmosphere and climate researchers. To monitor global tropopause via radio occultation (RO) data, there are mainly two methods, one is the widely used temperature lapse rate method, and the other is bending angle covariance transform method. In this paper, we use FengYun3-C (FY3C) and Meteorological Operational Satellite Program (MetOp) RO data and European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis data to analyse the difference of RO tropopause height calculated by the two methods mentioned above. To give an objective and complete analysis, we first take ECMWF lapse rate tropopause (LRT) height (LRTH) as reference to discuss the absolute bias of RO LRTH and RO bending angle tropopause (BAT) height (BATH), and then give the comparison results between RO LRTH and corresponding RO BATH as supplement to analyse the difference between tropopause height derived from the above two methods. The results indicate that BATH show consistent 0.8–1.2 km positive bias over tropics and high latitude region compared with LRTH, and over mid latitude region, results of BATH show less stability. Besides, the mean bias between BATH and LRTH presents different symmetrical characteristic during 2017.12–2018.2 (DJF) and 2018.6–2018.8 (JJA). However, the mean value of both LRTH and BATH show the similar tropopause variation trend, indicating the availability of both two methods.

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Ziyan Liu, Weihua Bai, Yueqiang Sun, Junming Xia, Guangyuan Tan, Cheng Cheng, Qifei Du, Xianyi Wang, Danyang Zhao, Yusen Tian, Xiangguang Meng, Congliang Liu, Yuerong Cai, and Dongwei Wang
 
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Ziyan Liu, Weihua Bai, Yueqiang Sun, Junming Xia, Guangyuan Tan, Cheng Cheng, Qifei Du, Xianyi Wang, Danyang Zhao, Yusen Tian, Xiangguang Meng, Congliang Liu, Yuerong Cai, and Dongwei Wang
Ziyan Liu, Weihua Bai, Yueqiang Sun, Junming Xia, Guangyuan Tan, Cheng Cheng, Qifei Du, Xianyi Wang, Danyang Zhao, Yusen Tian, Xiangguang Meng, Congliang Liu, Yuerong Cai, and Dongwei Wang

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Short summary
This papr mainly gives the results, comparison and bias analysis about thermal tropopause height calculated by two mainstream determination method in terms of different latitude locations and seasons. The tropopause height results in this paper are derived from the data of two RO missions, China's FengYun-3 and Europe's MetOp. For lapse rate tropopause, MetOp and FY3C show defference over subtropics. The difference between bending angle tropopause and lapse rate tropopause varies with seasons.