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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 30 Oct 2019

Submitted as: research article | 30 Oct 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Comparison of RO tropopause height based on different tropopause determination methods

Ziyan Liu1,2,3, Weihua Bai1,2, Yueqiang Sun1,2, Junming Xia1,2, Guangyuan Tan1,2,3, Cheng Cheng4, Qifei Du1,2, Xianyi Wang1,2, Danyang Zhao1,2, Yusen Tian1,2,3, Xiangguang Meng1,2, Congliang Liu1,2, Yuerong Cai1,2, and Dongwei Wang1,2 Ziyan Liu et al.
  • 1National Space Science Centre, Chinese Academy of Sciences (NSSC/CAS), Beijing 100190, China
  • 2Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4State Intellectual Property Office of the P.R.C, Beijing 100088, China

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.

Ziyan Liu et al.
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Ziyan Liu et al.
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Publications Copernicus
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.
This papr mainly gives the results, comparison and bias analysis about thermal tropopause height...