Abstract
The Asian subtropical westerly jet (AWJ) exerts crucial influences on Eurasian continent weather and climate. This paper analyzes the advantages and limitations of CRA-40, which is China’s first generation 40-yr (1979–2018) global atmosphere and land reanalysis product, in describing the characteristics of AWJ, compared with the ECMWF Reanalysis version 5 (ERA5) and NCEP Climate Forecast System Reanalysis (CFSR). The results show a close agreement across the three reanalyses on the whole. (1) In terms of climatology, overall differences of 200-hPa zonal wind across the three reanalyses are within ± 0.5 m s−1 (i.e., ± 2%). Large differences with maxima of ± 2 m s−1 (± 5%) appear over the Iranian Plateau and south of the Tibetan Plateau in the mid-upper troposphere in winter. (2) For seasonal cycle, the position and intensity of the AWJ centers in the three reanalyses are highly consistent, with correlation coefficient over 0.98. But there are some discrepancies in the zonal shift of the western AWJ center during the transition season. (3) On the interannual timescale, intensity of all AWJ centers varies consistently among the three reanalyses, while larger differences appear in their meridional displacement, especially in the eastern AWJ center. (4) For long-term variations, the three reanalyses all present a significant northward movement of the westerly jet axis in winter, and a southward displacement over central Asia (40°–80°E) and a northward migration over East Asia (80°–110°E) in summer. Thus, this study has provided confidence that CRA-40 has comparable performance with ERA5 and CFSR in depicting the characteristics of AWJ.
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References
Dao, S. Y., Y. J. Zhao, and X. M. Chen, 1958: The relationship between May-Yü in Far East and the behaviour of circulation over Asia. Acta Meteor. Sinica, 29, 119–134, doi: https://doi.org/10.11676/qxxb1958.014. (in Chinese)
Dao, S. Y., Y. F. Li, and Y. P. Wen, 1965: A preliminary study on the general circulation of East Asia in the upper troposphere and stratosphere. Acta Meteor. Sinica, 35, 155–165, doi: https://doi.org/10.11676/qxxb1965.019. (in Chinese)
Dee, D. P., S. M. Uppala, A. J. Simmons, et al., 2011: The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Quart. J. Roy. Meteor. Soc., 137, 553–597, doi: https://doi.org/10.1002/qj.828.
Du, Y., Q. Bao, and Z. Q. Xie, 2017: FGOALS model simulation of variation of East Asian subtropical westerly jet during Meiyu period. Chinese J. Atmos. Sci., 41, 603–617, doi: https://doi.org/10.3878/j.issn.1006-9895.1609.16185. (in Chinese)
Du, Y., Y. C. Zhang, and Z. Q. Xie, 2009: Location variation of the East Asia subtropical westerly jet and its effect on the summer precipitation anomaly over eastern China. Chinese J. Atmos. Sci., 33, 581–592, doi: https://doi.org/10.3878/j.issn.1006-9895.2009.03.15. (in Chinese)
Du, Y., T. Li, Z. Q. Xie, et al., 2016: Interannual variability of the Asian subtropical westerly jet in boreal summer and associated with circulation and SST anomalies. Climate Dyn., 46, 2673–2688, doi: https://doi.org/10.1007/s00382-015-2723-x.
Fu, Y. H., Z. D. Lin, and D. Guo, 2020: Improvement of the simulation of the summer East Asian westerly jet from CMIP5 to CMIP6. Atmos. Ocean. Sci. Lett., 13, 550–558, doi: https://doi.org/10.1080/16742834.2020.1746175.
Gao, Y. H., L. H. Xiao, D. L. Chen, et al., 2017: Quantification of the relative role of land-surface processes and large-scale forcing in dynamic downscaling over the Tibetan Plateau. Climate Dyn., 48, 1705–1721, doi: https://doi.org/10.1007/s00382-016-3168-6.
Gibson, J. K., P. W. Kållberg, S. Uppala, et al., 1997: ERA Description. ECMWF, Shinfield Park, Reading, 89 pp.
He, J., F. Q. Zhang, X. C. Chen, et al., 2019: Development and evaluation of an ensemble-based data assimilation system for regional reanalysis over the Tibetan Plateau and surrounding regions. J. Adv. Model. Earth Syst., 11, 2503–2522, doi: https://doi.org/10.1029/2019MS001665.
Hersbach, H., and D. Dee, 2016: ERA5 reanalysis is in production. ECMWF Newsletter, 147, 7–7. Available online at https://www.ecmwf.int/en/newsletter/147/news/era5-reanalysis-production. Accessed on 12 January 2021.
Huang, A. N., Y. Zhou, Y. C. Zhang, et al., 2014: Changes of the annual precipitation over central Asia in the twenty-first century projected by multimodels of CMIP5. J. Climate, 27, 6627–6646, doi: https://doi.org/10.1175/JCLI-D-14-00070.1.
Huang, G., and Y. Liu, 2011: Simulation of the East Asian subtropical westerly jet stream with GFDL AGCM (AM2.1). Atmos. Ocean. Sci. Lett., 4, 24–29, doi: https://doi.org/10.1080/16742834.2011.11446902.
Huang, W., S. Feng, J. H. Chen, et al., 2015: Physical mechanisms of summer precipitation variations in the Tarim basin in northwestern China. J. Climate, 28, 3579–3591, doi: https://doi.org/10.1175/JCLI-D-14-00395.1.
Hunt, K. M. R., J. Curio, A. G. Turner, et al., 2018: Subtropical westerly jet influence on occurrence of western disturbances and Tibetan Plateau vortices. Geophys. Res. Lett., 45, 8629–8636, doi: https://doi.org/10.1029/2018GL077734.
Ji, K., S. X. Wang, H. C. Zuo, et al., 2020: Effect of meridional position of East Asian subtropical jet on midsummer precipitation in eastern part of Northwest China. Arid Zone Res., 37, 10–17, doi: https://doi.org/10.13866/j.azr.2020.01.02. (in Chinese)
Jiang, Y. S., F. Chen, Y. H. Gao, et al., 2020: Assessment of uncertainty sources in snow cover simulation in the Tibetan Plateau. J. Geophs. Res. Atmos., 125, e2020JD032674, doi: https://doi.org/10.1029/2020JD032674.
Kuang, X. Y., Y. C. Zhang, and J. Liu, 2007: Seasonal variation of the East Asian subtropical westerly jet and its thermal mechanism. Acta Meteor. Sinica, 21, 192–203.
Li, C., and J. L. Sun, 2015: Role of the subtropical westerly jet waveguide in a southern China heavy rainstorm in December 2013. Adv. Atmos. Sci., 32, 601–612, doi: https://doi.org/10.1007/s00376-014-4099-y.
Li, C. X., T. B. Zhao, C. X. Shi, et al., 2020: Evaluation of daily precipitation product in China from the CMA global atmospheric interim reanalysis. J. Meteor. Res., 34, 117–136, doi: https://doi.org/10.1007/s13351-020-8196-9.
Li, X., Y. H. Gao, Y. J. Pan, et al., 2018: Evaluation of near-surface wind speed simulations over the Tibetan Plateau from three dynamical downscalings based on WRF model. Theor. Appl. Climatol., 134, 1399–1411, doi: https://doi.org/10.1007/s00704-017-2353-9.
Liang, X., L. P. Jiang, Y. Pan, et al., 2020: A 10-yr global land surface reanalysis interim dataset (CRA-Interim/Land): Implementation and preliminary evaluation. J. Meteor. Res., 34, 101–116, doi: https://doi.org/10.1007/s13351-020-9083-0.
Liao, J., K. X. Hu, H. Jiang, et al., 2018: Pre-process and data selection for assimilation of conventional observations in the CMA global atmospheric reanalysis. Adv. Meteor. Sci. Technol., 8, 133–142, doi: https://doi.org/10.3969/j.issn.2095-1973.2018.01.018. (in Chinese)
Liao, Q. H., S. Y. Tao, and H. J. Wang, 2004: Interannual variation of summer subtropical westerly jet in East Asia and its impacts on the climate anomalies of East Asia summer monsoon. Chinese J. Geophys., 47, 12–21, doi: https://doi.org/10.1002/cjg2.449.
Lin, Z. D., and R. Y. Lu, 2005: Interannual meridional displacement of the East Asian upper-tropospheric jet stream in summer. Adv. Atmos. Sci., 22, 199–211, doi: https://doi.org/10.1007/BF02918509.
Lin, Z. D., Y. H. Fu, and R. Y. Lu, 2019: Intermodel diversity in the zonal location of the climatological East Asian westerly jet core in summer and association with rainfall over East Asia in CMIP5 models. Adv. Atmos. Sci., 36, 614–622, doi: https://doi.org/10.1007/s00376-019-8221-z.
Liu, Z. Q., C. X. Shi, Z. J. Zhou, et al., 2017: CMA global reanalysis (CRA-40): Status and plans. Proc. 5th International Conference on Reanalysis, 13–17 November, Nat. Meteor. Int. Canter, Rome, Italy, 1–16.
Lu, J. H., and T. Schneider, 2017: Evolving perspectives on abrupt seasonal changes of the general circulation. Adv. Atmos. Sci., 34, 1185–1194, doi: https://doi.org/10.1007/s00376-017-7068-4.
Peng, D. D., and T. J. Zhou, 2017: Why was the arid and semiarid northwest China getting wetter in the recent decades. J. Geophys. Res. Atmos., 122, 9060–9075, doi: https://doi.org/10.1002/2016JD026424.
Saha, S., S. Moorthi, H. L. Pan, et al., 2010: The NCEP climate forecast system reanalysis. Bull. Amer. Meteor. Soc., 91, 1015–1058, doi: https://doi.org/10.1175/2010BAMS3001.1.
Saha, S., S. Moorthi, X. R. Wu, et al., 2014: The NCEP Climate Forecast System version 2. J. Climate, 27, 2185–2208, doi: https://doi.org/10.1175/JCLI-D-12-00823.1.
Schiemann, R., D. Lüthi, and C. Schär, 2009: Seasonality and interannual variability of the westerly jet in the Tibetan Plateau region. J. Climate, 22, 2940–2957, doi: https://doi.org/10.1175/2008JCLI2625.1.
Seto, R., T. Koike, and M. Rasmy, 2013: Analysis of the vertical structure of the atmospheric heating process and its seasonal variation over the Tibetan Plateau using a land data assimilation system. J. Geophs. Res. Atmos., 118, 12403–12421, doi: https://doi.org/10.1002/2013JD020072.
Staff Members of the Section of Synoptic and Dynamic Meteorology, Institute of Geophysics and Meteorology, Academia Sinica, 1957: On the general circulation over Eastern Asia (I). Tellus, 9, 432–446, doi: https://doi.org/10.3402/tellusa.v9i4.9136.
Staff Members of the Section of Synoptic and Dynamic Meteorology, Institute of Geophysics and Meteorology, Academia Sinica, 1958a: On the general circulation over Eastern Asia (II). Tellus, 10, 58–75, doi: https://doi.org/10.3402/tellusa.v10i1.9219.
Staff Members of the Section of Synoptic and Dynamic Meteorology, Institute of Geophysics and Meteorology, Academia Sinica, 1958b: On the general circulation over Eastern Asia (III). Tellus, 10, 299–312, doi: https://doi.org/10.3402/tellusa.v10i3.9250.
Uppala, S. M., P. W. KÅllberg, A. J. Simmons, et al., 2005: The ERA-40 reanalysis. Quart. J. Roy. Meteor. Soc., 131, 2961–3012, doi: https://doi.org/10.1256/qj.04.176.
Wang, M. Y., S. Yao, L. P. Jiang, et al., 2018: Collection and preprocessing of satellite remote-sensing data in CRA-40 (CMA’s global atmospheric reanalysis). Adv. Meteor. Sci. Technol., 8, 158–163, doi: https://doi.org/10.3969/j.issn.2095-1973.2018.01.021. (in Chinese)
Wei, W., R. H. Zhang, M. Wen, et al., 2017: Relationship between the Asian westerly jet stream and summer rainfall over central Asia and north China: Roles of the Indian monsoon and the South Asian high. J. Climate, 30, 537–552, doi: https://doi.org/10.1175/JCLI-D-15-0814.1.
Xia, X., R. C. Ren, G. X. Wu, et al., 2016: An analysis on the spatiotemporal variations and dynamic effects of the tropopause and the related stratosphere-troposphere coupling surrounding the Tibetan Plateau area. Acta Meteor. Sinica, 74, 525–541, doi: https://doi.org/10.11676/qxxb2016.036. (in Chinese)
Xie, Z. Q., Y. Du, and S. Yang, 2015: Zonal extension and retraction of the subtropical westerly jet stream and evolution of precipitation over East Asia and the western Pacific. J. Climate, 28, 6783–6798, doi: https://doi.org/10.1175/JCLI-D-14-00649.1.
Yan, Y. H., C. F. Li, and R. Y. Lu, 2019: Meridional displacement of the East Asian upper-tropospheric westerly jet and its relationship with the East Asian summer rainfall in CMIP5 simulations. Adv. Atmos. Sci., 36, 1203–1216, doi: https://doi.org/10.1007/s00376-019-9066-1.
Yan, Z. B., Z. H. Lin, and H. Zhang, 2014: The relationship between the East Asian subtropical westerly jet and summer precipitation over East Asia as simulated by the IAP AGCM4.0. Atmos. Ocean. Sci. Lett., 7, 487–492, doi: https://doi.org/10.3878/AOSL20140048.
Yang, L. M., and Q. Y. Zhang, 2008a: Climate features of summer Asia subtropical westerly jet stream. Climatic Environ. Res., 13, 10–20. (in Chinese)
Yang, L. M., and Q. Y. Zhang, 2008b: Interannual variation of summer precipitation in Xinjiang and Asian subtropical westerly jet stream. J. Appl. Meteor. Sci., 19, 171–179, doi: https://doi.org/10.3969/j.issn.1001-7313.2008.02.006. (in Chinese)
Yeh, T. C., 1982: Some aspects of the thermal influences of the Qinghai-Tibetan Plateau on the atmospheric circulation. Arch. Met. Geoph. Biocl. A., 31, 205–220, doi: https://doi.org/10.1007/BF02258032.
Yeh, T. C., S. Y. Dao, and M. T. Li, 1958: The abrupt change of circulation over Northern Hemisphere during June and October. Acta Meteor. Sinica, 29, 249–263. (in Chinese)
Yin, J. F., X. D. Liang, F. Chen, et al., 2018: Development of atmospheric data assimilation techniques and regional reanalysis datasets in the East Asia. Adv. Meteor. Sci. Techol., 8, 79–84, doi: https://doi.org/10.3969/j.issn.2095-1973.2018.01.009. (in Chinese)
Yu, X. J., J. Du, M. Z. Wang, et al., 2018: Impact of assimilating the new radiosonde data over Qinghai-Tibetan Plateau on summer rainfall forecast over southern Xinjiang. Plateau Meteor., 37, 13–27, doi: https://doi.org/10.7522/j.issn.1000-0534.2017.00034. (in Chinese)
Zhang, Y. C., and D. Q. Huang, 2011: Has the East Asian westerly jet experienced a poleward displacement in recent decades. Adv. Atmos. Sci., 28, 1259–1265, doi: https://doi.org/10.1007/s00376-011-9185-9.
Zhang, Y. C., X. Y. Kuang, W. D. Guo, et al., 2006: Seasonal evolution of the upper-tropospheric westerly jet core over East Asia. Geophys. Res. Lett., 33, L11708, doi: https://doi.org/10.1029/2006GL026377.
Zhao, B., B. Zhang, C. X. Shi, et al., 2019: Comparison of the global energy cycle between Chinese reanalysis interim and ECMWF reanalysis. J. Meteor. Res., 33, 563–575, doi: https://doi.org/10.1007/s13351-019-8129-7.
Zhao, Y., M. Z. Wang, A. N. Huang, et al., 2014a: Relationships between the West Asian subtropical westerly jet and summer precipitation in northern Xinjiang. Theor. Appl. Climatol., 116, 403–411, doi: https://doi.org/10.1007/s00704-013-0948-3.
Zhao, Y., A. N. Huang, Y. Zhou, et al., 2014b: Impact of the middle and upper tropospheric cooling over central Asia on the summer rainfall in the Tarim Basin, China. J. Climate, 27, 4721–4732, doi: https://doi.org/10.1175/JCLI-D-13-00456.1.
Zhao, Y., X. J. Yu, J. Q. Yao, et al., 2018: Evaluation of the subtropical westerly jet and its effects on the projected summer rainfall over central Asia using multi-CMIP5 models. Int. J. Climatol., 38, e1176–e1189, doi: https://doi.org/10.1002/joc.5443.
Zhao, Y., X. J. Yu, J. Q. Yao, et al., 2019: The concurrent effects of the South Asian monsoon and the plateau monsoon over the Tibetan Plateau on summer rainfall in the Tarim Basin of China. Int. J. Climatol., 39, 74–88, doi: https://doi.org/10.1002/joc.5783.
Zhu, B. Z., Y. H. Ding, and H. B. Luo, 1990: A review of the atmospheric general circulation and monsoon in East Asia. Acta Meteor. Sinica, 4, 399–416.
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Supported by the Program of International S&T Cooperation of Chinese Academy of Sciences (2018YFE0196000) and National Natural Science Foundation of China (41675076).
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Yu, X., Zhang, L., Zhou, T. et al. The Asian Subtropical Westerly Jet Stream in CRA-40, ERA5, and CFSR Reanalysis Data: Comparative Assessment. J Meteorol Res 35, 46–63 (2021). https://doi.org/10.1007/s13351-021-0107-1
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DOI: https://doi.org/10.1007/s13351-021-0107-1