Articles | Volume 21, issue 17
10 Sep 2021
Research article | 10 Sep 2021
Water vapor anomaly over the tropical western Pacific in El Niño winters from radiosonde and satellite observations and ERA5 reanalysis data
Minkang Du et al.
No articles found.
Zheng Ma, Yun Gong, Shaodong Zhang, Qiao Xiao, Chunming Huang, and Kaiming Huang
Atmos. Chem. Phys., 22, 13725–13737,Short summary
We present a novel method to measure the amplitudes of traveling quasi-5-day oscillations (Q5DOs) in the middle atmosphere during sudden stratospheric warming events based on satellite observations. Simulations and observations demonstrate that the previously reported traveling Q5DOs might be contaminated by stationary planetary waves (SPWs). The new fitting method is developed by inhibiting the effect of a rapid and large change in SPWs.
Yun He, Zhenping Yin, Fuchao Liu, and Fan Yi
Atmos. Chem. Phys., 22, 13067–13085,Short summary
A method is proposed to identify the sole presence of heterogeneous nucleation and competition between heterogeneous and homogeneous nucleation for dust-related cirrus clouds by characterizing the relationship between dust ice-nucleating particle concentration calculated from CALIOP using the POLIPHON method and in-cloud ice crystal number concentration from the DARDAR-Nice dataset. Two typical cirrus cases are shown as a demonstration, and the proposed method can be extended to a global scale.
Xiansi Huang, Kaiming Huang, Hao Cheng, Shaodong Zhang, Wei Cheng, Chunming Huang, and Yun Gong
Atmos. Chem. Phys. Discuss.,
Revised manuscript not acceptedShort summary
Using radar observations and reanalysis data for 9 years, we demonstrate clearly for the first time that resonant interactions between tides and annual and semiannual oscillations do occur in the mesosphere and lower thermosphere. The resonant matching conditions of frequency and wavenumber are exactly satisfied for the interacting triad. At some altitudes, the secondary waves are stronger than the tides, thus in tidal studies, the secondary waves may be mistaken for the tides if no carefully.
Yang Yi, Fan Yi, Fuchao Liu, Yunpeng Zhang, Changming Yu, and Yun He
Atmos. Chem. Phys., 21, 17649–17664,Short summary
Our lidar observations reveal the complete microphysical process of hydrometeors falling from mid-level stratiform clouds. We find that the surface rainfall begins as supercooled mixed-phase hydrometeors fall out of a liquid parent cloud base. We find also that the collision–coalescence growth of precipitating raindrops and subsequent spontaneous breakup always occur around 0.6 km altitude during surface rainfalls. Our findings provide new insights into stratiform precipitation formation.
Jianping Guo, Jian Zhang, Kun Yang, Hong Liao, Shaodong Zhang, Kaiming Huang, Yanmin Lv, Jia Shao, Tao Yu, Bing Tong, Jian Li, Tianning Su, Steve H. L. Yim, Ad Stoffelen, Panmao Zhai, and Xiaofeng Xu
Atmos. Chem. Phys., 21, 17079–17097,Short summary
The planetary boundary layer (PBL) is the lowest part of the troposphere, and boundary layer height (BLH) is the depth of the PBL and is of critical importance to the dispersion of air pollution. The study presents the first near-global BLH climatology by using high-resolution (5-10 m) radiosonde measurements. The variations in BLH exhibit large spatial and temporal dependence, with a peak at 17:00 local solar time. The most promising reanalysis product is ERA-5 in terms of modeling BLH.
Yun He, Yunfei Zhang, Fuchao Liu, Zhenping Yin, Yang Yi, Yifan Zhan, and Fan Yi
Atmos. Meas. Tech., 14, 5939–5954,Short summary
The POLIPHON method can retrieve the height profiles of dust-related particle mass and ice-nucleating particle (INP) concentrations. Applying a dust case data set screening scheme based on the lidar-derived depolarization ratio (rather than Ångström exponent for 440–870 nm and AOD at 532 nm), the mixed-dust-related conversion factors are retrieved from sun photometer observations over Wuhan, China. This method may potentially be extended to regions influenced by mixed dust.
Fuchao Liu, Fan Yi, Zhenping Yin, Yunpeng Zhang, Yun He, and Yang Yi
Atmos. Chem. Phys., 21, 2981–2998,Short summary
Using high-resolution lidar measurements, this process-based study reveals that the clear-day convective boundary layer evolves in four distinct stages differing in depth growth rate and depth fluctuation magnitudes. The accompanying entrainment zone thickness (EZT) shows a discrepancy in statistical mean and standard deviation for different seasons and developing stages. Common EZT characteristics also exist. These findings help us understand the atmospheric boundary layer evolution.
Lei Qiao, Gang Chen, Shaodong Zhang, Qi Yao, Wanlin Gong, Mingkun Su, Feilong Chen, Erxiao Liu, Weifan Zhang, Huangyuan Zeng, Xuesi Cai, Huina Song, Huan Zhang, and Liangliang Zhang
Atmos. Meas. Tech., 13, 5697–5713,
Feilong Chen, Gang Chen, Yufang Tian, Shaodong Zhang, Kaiming Huang, Chen Wu, and Weifan Zhang
Ann. Geophys., 37, 631–643,Short summary
Using the Beijing MST radar echo-power observations collected during the period November 2011–May 2017, the structure and variability of the tropopause over Xianghe, China (39.75° N, 116.96° E), was presented. Our comparison results showed a good agreement between the radar and thermal tropopauses during all seasons. In contrast, the consistency between the radar and dynamical tropopauses is poor during summer. Diurnal oscillation in tropopause height is commonly observed during all seasons.
Jian Zhang, Shao Dong Zhang, Chun Ming Huang, Kai Ming Huang, Ye Hui Zhang, Yun Gong, and Quan Gan
Ann. Geophys. Discuss.,
Publication in ANGEO not foreseenShort summary
Turbulence dissipation rate has inter-annual variations and follows a lognormal distribution. The magnitudes of turbulence detected by radiosonde and radar are roughly comparable. Turbulence cannot predicted by instabilities well but trends to be vigorous under the instability condition. The propagating gravity waves in the lower atmosphere can enhance atmospheric instabilities, and the temporal variations of waves can roughly estimate the turbulence dissipation rate at different height.
Feilong Chen, Gang Chen, Chunhua Shi, Yufang Tian, Shaodong Zhang, and Kaiming Huang
Ann. Geophys., 36, 1403–1417,Short summary
Downward stratospheric intrusions are well known as an important source of tropospheric ozone. In the light of the present understanding, several unanswered questions remain regarding the use of VHF radars to identify stratospheric intrusions. Our study found that the radar-observed strong downdrafts preceding the rapid tropopause ascent are a strong diagnostic for possible intrusions. This will have important implications for air-quality monitoring and long-term estimation of troposphere ozone.
Shao Dong Zhang, Chun Ming Huang, Kai Ming Huang, Ye Hui Zhang, Yun Gong, and Quan Gan
Ann. Geophys., 35, 107–116,Short summary
We present the first statistical results of vertical wind fluctuation spectra, which revealed a very shallow spectral structure, with mean slopes of −0.58 and −0.23 in the troposphere and lower stratosphere, respectively. No existing spectral theories can comprehensively explain the observed three-dimensional wind spectra, indicating that the spectral features of atmospheric fluctuations are far from fully understood.
Yue Jia, Shao Dong Zhang, Fan Yi, Chun Ming Huang, Kai Ming Huang, Yun Gong, and Quan Gan
Ann. Geophys., 34, 331–345,
K. M. Huang, A. Z. Liu, S. D. Zhang, F. Yi, C. M. Huang, Q. Gan, Y. Gong, Y. H. Zhang, and R. Wang
Ann. Geophys., 33, 1321–1330,
Q. Gan, J. Yue, L. C. Chang, W. B. Wang, S. D. Zhang, and J. Du
Ann. Geophys., 33, 913–922,Short summary
The 6.5-day traveling planetary wave is able to impact the ionosphere/thermosphere via a dissipation mechanism. Ionospheric TEC and thermosphere O/N2 exhibit an apparent decrease as the result of extra meridional circulation induced by 6.5-day wave dissipation. Our work suggests that the modulation of E-dynamo is not the unique pathway through which planetary waves substantially influence the IT system.
C. Huang, S. Zhang, Q. Zhou, F. Yi, K. Huang, Y. Gong, Y. Zhang, and Q. Gan
Ann. Geophys., 33, 865–874,Short summary
The diurnal tide and its variability in the lower atmosphere over Chongyang (114.14ºE，29.53ºN) were studied based on the newly established Wuhan University VHF radar observations in the whole year of 2012. We find that the diurnal tide was the dominant tidal component and showed remarkable height and season variations, as well as dramatic short-term variability.
S. D. Zhang, C. M. Huang, K. M. Huang, F. Yi, Y. H. Zhang, Y. Gong, and Q. Gan
Ann. Geophys., 32, 1129–1143,
K. M. Huang, S. D. Zhang, F. Yi, C. M. Huang, Q. Gan, Y. Gong, and Y. H. Zhang
Ann. Geophys., 32, 263–275,
K. M. Huang, A. Z. Liu, S. D. Zhang, F. Yi, C. M. Huang, Q. Gan, Y. Gong, and Y. H. Zhang
Ann. Geophys., 31, 2039–2048,
C. M. Huang, S. D. Zhang, F. Yi, K. M. Huang, Y. H. Zhang, Q. Gan, and Y. Gong
Ann. Geophys., 31, 1731–1743,
Y. Y. Huang, S. D. Zhang, F. Yi, C. M. Huang, K. M. Huang, Q. Gan, and Y. Gong
Ann. Geophys., 31, 1061–1075,
Related subject area
Subject: Dynamics | Research Activity: Laboratory Studies | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)Three dominant synoptic atmospheric circulation patterns influencing severe winter haze in eastern ChinaImpact of turbulence on aeolian particle entrainment: results from wind-tunnel experimentsLinkages between the atmospheric transmission originating from the North Atlantic Oscillation and persistent winter haze over BeijingComparison of the influence of two types of cold surge on haze dispersion in eastern ChinaCharacteristics of the summer atmospheric boundary layer height over the Tibetan Plateau and influential factorsThe relationship between anticyclonic anomalies in northeastern Asia and severe haze in the Beijing–Tianjin–Hebei regionResponse of early winter haze in the North China Plain to autumn Beaufort sea iceUnderstanding severe winter haze events in the North China Plain in 2014: roles of climate anomaliesUnderstanding the recent trend of haze pollution in eastern China: roles of climate changeImpacts of the mountain–plains solenoid and cold pool dynamics on the diurnal variation of warm-season precipitation over northern China
Shiyue Zhang, Gang Zeng, Tijian Wang, Xiaoye Yang, and Vedaste Iyakaremye
Atmos. Chem. Phys. Discuss.,
Revised manuscript accepted for ACPShort summary
The severe haze days in eastern China (HDEC) is affected by the atmospheric circulation variations on synoptic scale, while the dominant atmospheric circulation patterns influencing HDEC and what are the differences between them are still unclear. This study obtains three dominant circulation types that could lead to severe HDEC and investigates the differences between them. The results provide a basis for establishing haze prediction and management policies applicable.
Jie Zhang, Guang Li, Li Shi, Ning Huang, and Yaping Shao
Atmos. Chem. Phys., 22, 9525–9535,Short summary
Sand and dust emission are usually investigated by wind-tunnel experiments. However, wind-tunnel flows are usually neutrally stratified without large eddies, which typically develop in the convective atmospheric boundary layer. Here we proposed a novel technique by deploying a piece of randomly fluttering cloth in a wind tunnel to generate the large eddies and found them to enhance the entrainment of sand and dust particles, which explains why large eddies are important to aeolian entrainment.
Muyuan Li, Yao Yao, Ian Simmonds, Dehai Luo, Linhao Zhong, and Lin Pei
Atmos. Chem. Phys., 21, 18573–18588,Short summary
We found that an atmospheric transmission constituted by a western-type positive North Atlantic Oscillation (NAO+) pattern and a positive East Atlantic/West Russia (EA/WR+) pattern plays an essential role in the persistent haze events in Beijing. As the origin of the atmospheric transmission, the state of the western-type NAO pattern can help to increase the predictability of winter haze days and persistent haze events in Beijing on interannual and daily-to-weekly timescales.
Shiyue Zhang, Gang Zeng, Xiaoye Yang, Ruixi Wu, and Zhicong Yin
Atmos. Chem. Phys., 21, 15185–15197,Short summary
This study classified the winter cold surge in eastern China into blocking cold surge and wave-train cold surge and investigated the difference of haze dispersion ability between the two types. The results show that the haze dispersion of blocking cold surge is weaker than that of wave-train cold surge. In the past 4 decades, the frequency of wave-train (blocking) cold surge shows a downward (upward) trend, which means that the ability of cold surge to disperse haze is declining.
Junhui Che and Ping Zhao
Atmos. Chem. Phys., 21, 5253–5268,Short summary
The importance of the atmospheric boundary layer (ABL) is recognized, but little is known about the Tibetan Plateau (TP) ABL due to the scarce data. Based on new observations from the Third Tibetan Plateau Atmospheric Scientific Experiment, we reveal a big drop in the ABL height from the west to the east of the TP for the first time, which is more remarkable than in the United States and all of China. This steep inhomogeneity in the TP is due to the difference in local climate and environment.
Wogu Zhong, Zhicong Yin, and Huijun Wang
Atmos. Chem. Phys., 19, 5941–5957,Short summary
Haze pollution in the Beijing–Tianjin–Hebei region has become increasingly more severe and persistent in recent years.This research focused on severe haze during 2014–2016 and examined the impacts of the anticyclonic anomalies over northeastern Asia. The advance and retreat of anticyclonic anomalies over northeastern Asia (AANA) corresponded with the emergence and dissipation of severe haze, illustrating that AANA could be effective forecast indicators for air quality.
Zhicong Yin, Yuyan Li, and Huijun Wang
Atmos. Chem. Phys., 19, 1439–1453,Short summary
Recently, haze pollution in the North China has been serious and disastrous. The preceding heavy autumn sea ice intensified the early winter haze pollution over North China. The results provide possibilities for the seasonal to interannual prediction of haze pollution that helps to determine whether extra stringent emission control measures are needed to counteract the effect of climate variability.
Zhicong Yin, Huijun Wang, and Huopo Chen
Atmos. Chem. Phys., 17, 1641–1651,Short summary
The number of winter haze days over the north-central North China Plain in 2014 was largest in the past 30 years. With the anticyclone circulation over North China taken as an intermediate, the positive phases of the east Atlantic/west Russia, western Pacific, and Eurasian patterns led to a larger number of haze days in 2014. The related external forcing included preceding autumn Arctic sea ice, winter and pre-autumn surface temperature, and pre-autumn sea surface temperature in the Pacific.
Hui-Jun Wang and Huo-Po Chen
Atmos. Chem. Phys., 16, 4205–4211,Short summary
The variability of the autumn Arctic sea ice extent, local precipitation and surface wind during winter is most influential to the haze pollution change in eastern China. The joint effect of fast increase of total energy consumption, rapid decline of Arctic sea ice extent and reduced precipitation and surface winds intensified the haze pollution in central North China after 2000. There is similar conclusion for haze pollution in eastern South China after 2000.
Xinghua Bao and Fuqing Zhang
Atmos. Chem. Phys., 13, 6965–6982,
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El Niño has an important influence on climate systems. There are obviously negative water vapor anomalies from radiosonde observations in the tropical western Pacific during El Niño. The tropical Hadley, Walker, and monsoon circulation variations are revealed to play different roles in the observed water vapor anomaly in different types of El Niños. The Walker (monsoon) circulation anomaly made a major contribution in the 2015/16 (2009/10) strong eastern Pacific (central Pacific) El Niño event.
El Niño has an important influence on climate systems. There are obviously negative water vapor...