Tianhe Wang

Tianhe Wang
Lanzhou University | LZU · Department of Atmospheric Science

PhD

About

49
Publications
9,408
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Introduction
I am a researcher in the field of Atmosphere Science. Particularly, I prefer to use satellite-based and surface-based measurements to study the climatic effect of dust aerosol and the process of dust cycle. My recent projects are at three aspects: (1) Climatic effects of dust aerosol on arid/semi-arid region; (2) Transport mechanism of Asian dust aerosol; (3) Quantification of dust cycle based on surface/satellite observations.
Additional affiliations
August 2016 - July 2017
University at Albany, The State University of New York
Position
  • Researcher
March 2006 - February 2008
University at Albany, The State University of New York
Position
  • Researcher
Education
September 2004 - June 2009
Lanzhou University
Field of study
  • Meteorology

Publications

Publications (49)
Article
Full-text available
Dust aerosol can affect the atmospheric thermal structure and exert great melting potential on snow and ice sheets. In this study, the decadal climatology of dust‐forced radiative heating (DRH) in the atmosphere over Tibetan Plateau and its surroundings (TPS) was investigated using the Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART) mo...
Article
Dust aerosol, one of the important light-absorbing impurities in snow and ice sheets in the Tibet Plateau (TP), can significantly affect the magnitude and timing of snow melting and glacier recession by altering the surface albedo. It is thus of great importance to understand the potential source and transport mechanism of the dust aerosol over the...
Article
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The satellite-based estimation of the dust mass concentration (DMC) is essential for accurately evaluating the global biogeochemical cycle of the dust aerosols. As for the uncertainties in estimating DMC caused by mixing dust and pollutants and assuming a fixed value for the mass extinction efficiency (MEE), a classic lidar-photometer method is emp...
Article
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A full understanding of the Asian dust cycle can help with evaluation of the profound impact of mineral dust on human health, the ecosystem, the terrestrial and oceanic biogeochemical cycles, and the weather and climate. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP)-based 3-D dust detection and routine sampling capability, with the...
Article
The Pan-Third Pole (PTP), stretching from Eastern Asia to Middle-central Europe, has experienced unprecedented accelerated warming and even retreat of glaciers. Absorbing aerosols reduce snow and ice albedo and radiative forcing, consequently enhancing a great melting of snow cover and ice sheet in the PTP. Employing the 10-year (2007–2016) space-b...
Article
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Central Asia is one of the most important sources of mineral saline dust worldwide. A comprehensive understanding of Central Asian dust transport is essential for evaluating its impacts on human health, ecological safety, weather and climate. This study first puts forward an observation-based climatology of Central Asian dust transport flux by usin...
Article
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This study analyzed the surface radiation characteristics and evaluated downward cloud radiative forcing (CRF) in southern Xinjiang during summer 2019. Surface radiation fluxes show prominent day-to-day and diurnal variations, with the maximums of 915.6, 921.2, and 121.9 Wm−2, respectively, for total, direct, and diffuse shortwave radiations under...
Article
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Previous studies have shown that dust aerosols may accelerate the melting of snow and glaciers over the Tibetan Plateau. To investigate the vertical structure of dust aerosols, we conducted a ground-based observation by using multi-wavelength polarization lidar which is designed for continuous network measurements. In this study, we used the lidar...
Article
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青藏高原作为“亚洲水塔”,对东亚乃至全球气候有着重要影响。本文介绍了中国科学院A类战略性先导科技专项“泛第三极环境变化与绿色丝绸之路建设”子课题3“气溶胶-云互馈对西风季风水汽输送的影响”研究的主要结果。针对青藏高原为核心的泛第三极地区,项目研究结果主要包括:(1)沙尘、污染沙尘、抬升烟尘和污染性大陆气溶胶/烟尘是泛第三极地区最主要的气溶胶类型,其中沙尘的排放和输送对青藏高原西部和柴达木盆地大气热力结构的影响非常显著;(2)高原过冷水云的发生频率及其在高原能量收支中的作用比暖水云高,降水主要是由冰云和混合相云产生的,尤其是在暖季。虽然高原大气呈现暖湿化趋势,但水汽收入增多并不能弥补地表水资源由于增温的流失,高原东部水循环呈减弱趋势,而西部水循环则相反。(3)黑碳气溶胶使南亚夏季风减弱、东亚夏...
Article
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选取全球气溶胶自动观测网在东亚、中亚和南亚地区观测记录最长的兰州大学半干旱气候与环境观测站(SACOL)、杜尚别站和斋浦尔站的数据, 通过沙尘和污染沙尘的有效分离, 对比分析了3 站的沙尘特性和大气含沙量. 结果表明, 3 站沙尘天气出现频次的季节差异显著, 且污染沙尘明显高于沙尘, SACOL 站多发于3-4 月, 杜尚别站多发于6-10 月, 出现频率最高的斋浦尔站集中于3-7 月. 3 站沙尘和污染沙尘的光学厚度变化特征与其出现频次一致, 斋浦尔站由于人为污染的影响, 污染沙尘具有较高的吸收性. 沙尘和污染沙尘体积谱均以粗模态为主, 且浓度峰值差异显著. 3 站沙尘质量消光系数一致且介于0.3~0.5 m2/g, 大气含沙量差异显著, 其月平均最大值分别为0.33(3月)、0.24(7...
Article
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The rapid warming and consequent retreat of glaciers across the Tibetan Plateau (TP) have given rise to the debate on the ability of the atmospheric water supply to alleviate the depletion of surface water storage. We investigate long-term changes in atmospheric water vapor balance across the TP using 40-year fifth generation European Centre for Me...
Article
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选取塔里木盆地(矿物沙尘源)、伊朗高原(矿物沙尘传输区)和咸海地区(盐尘源)三个典型代表区,结合近10 年(2007-2016 年)的主动(CALIOP/CALIPSO)和被动(OMI/Arua)卫星遥感气溶胶产品,对比分析了沙尘与盐尘气溶胶光学特性的异同。结果表明:(1)柱气溶胶光学厚度具有相似的逐月变化规律,塔里木盆地和咸海地区最大值出现在4 月,而伊朗高原出现在夏季;(2)塔里木盆地和咸海地区的气溶胶最大出现频率均接近近地面,而伊朗高原主要集中在海平面以上2~3 km;(3)伊朗高原传输型沙尘与咸海地区盐尘的不规则程度均小于塔里木盆地源区沙尘,且盐尘的粒径大小明显小于矿物沙尘,CALIOP 将其主要识别为污染沙尘;(4)咸海地区盐尘的光学吸收性与塔里木盆地源区沙尘相当,略大于伊朗高原的...
Article
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Using almost 10 years of observations of clouds and aerosols from the US Southern Great Plains (SGP) atmospheric observatory and the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) in China, the impact of aerosols on single-layer overcast clouds over continental land for different regimes were investigated. Atmospheric c...
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激光雷达作为一种新兴的主动遥感探测工具"被广泛应用于大气遥感、环境监测等领域。星载激光雷达由于其较广的探测范围、较高的时空分辨率,可获得连续的廓线数据等优势,已经成为全球及区域气溶胶和云特性观测研究的强有力工具。本文总结了自2006年CALIPSO卫星发射以来,中国科学家在利用其开展沙尘气溶胶及污染研究方面的工作,重点阐述了沙尘气溶胶的时空分布、远距离传输、分类识别、光学特性、沙尘释放、辐射与气候效应,以及灰霾和烟尘特性等方面的最新研究成果。对以上研究成果的梳理,有助于深入理解中国在利用星载激光雷达开展沙尘与污染研究的水平,也为未来开拓中国自主研发星载激光雷达的遥感应用领域奠定了基础。
Article
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摘要: 针对兰州大学半干旱气候与环境观测站在敦煌地区的沙尘气溶胶加强观测试验ꎬ 选取2012年春季自然和污染沙尘两种典型天气个例,利用激光雷达退偏观测的优势分离粗(沙尘)、细(背景气溶胶)粒子,反演并对比分析了沙尘气溶胶消光系数及质量浓度的垂直分布特征,研究发现,以4月26日为代表的自然沙尘,粒子退偏比垂直廓线均大于30%,质量浓度呈现单峰结构,1.5km出现最大值(1070μg/m-3),以4月6日为代表的污染沙尘,有明显的气溶胶分层现象,粒子退偏比介于5%~20%,沙尘质量浓度介于2~45μg/m-3,由于局地污染的影响,污染沙尘的质量消光系数(0.79m2/g-1)明显大于自然沙尘(0.48m2/g-1),因此,为了准确评估沙尘气溶胶的质量浓度,对沙尘天气进行分类,并利用粒子退偏比有效...
Article
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利用2007 年3 月-2010 年2 月3 年的CloudSat 资料, 2008 年3 月-2010 年2 月的TRMM_3B43 资料, 分析了东亚季风区(EMA)和南亚季风区(SMA)降水量的季节性差异、降水云的发生频率及宏观垂直结构特征(包括云层数、云厚、雨顶高度、冻结降水出现最大高度、雷达反射率垂直分布)及云类型季节变化. 结果表明, EMA降水云的出现频率随季节变化先降低后升高, SMA则相反, 先升高再降低, 夏季达到最大值. EMA降水云以单层云为主, 云顶高度随季节有明显的起伏变化, SMA则以单层云与双层云为主. EMA降水云云厚的季节变化明显: 夏季最厚, 冬季最薄; SMA云厚无明显季节变化, 云厚发展高于EMA. 两区域降水云均以深对流云及雨层云为主, 但EMA降...
Article
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利用2006年6月至2012年12月的CALIPSO Level 2 VFM产品、5km分辨率的Aerosol Profile、Cloud Layer产品以及MISR反演的产品,揭示了东亚地区不同高度层上沙尘的时空分布特征,重点对比分析了东亚沙尘源区晴空和云上沙尘的垂直分布特征、消光系数和光学厚度。结果表明:塔克拉玛干沙漠和戈壁沙漠是东亚沙尘的主要源区,沙尘出现频率具有显著的季节差异,春季最多,夏秋相当,冬季最少,无论在晴空还是有云条件下,前者出现频率大于后者。对于同一地区而言,云上沙尘出现的最大高度较晴空沙尘更高。塔克拉玛干沙漠云上沙尘消光系数高值区集中在2~4km,而戈壁沙漠则集中在3~5km,但是在云层之上晴空和云上沙尘消光系数差别不大。塔克拉玛干沙漠以沙尘气溶胶为主,约占总气溶胶光学...
Article
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East Asian dust (EAD) exerts considerable impacts on the energy balance and climate/climate change of the earth system through its influence on solar and terrestrial radiation, cloud properties, and precipitation efficiency. Providing an accurate description of the life cycle and climate effects of EAD is therefore critical to better understanding...
Chapter
Due to the large global extent of arid and semi-arid regions, mineral dust in the atmosphere and its interactions with clouds and precipitation can have a substantial impact on regional and global climate. Dust aerosols can influence the radiative energy budget directly by scattering and absorbing solar radiation and indirectly by acting as cloud c...
Article
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Based on 8 years of (January 2008–December 2015) cloud phase information from the GCM-Oriented Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Cloud Product (GOCCP), aerosol products from CALIPSO and meteorological parameters from the ERA-Interim products, the present study investigates the effects of atmospheric dynamic...
Data
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Based on 8 years of (January 2008–December 2015) cloud phase information from the GCM-Oriented Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Cloud Product (GOCCP), aerosol products from CALIPSO and meteorological parameters from the ERA-Interim products, the present study investigates the effects of atmospheric dynamic...
Article
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Cloud–radiation processes play an important role in regional energy budgets and surface temperature changes over arid regions. Cloud radiative effects (CREs) are used to quantitatively measure the aforementioned climatic role. This study investigates the characteristics of CREs and their temporal variations over three arid regions in central Asia (...
Article
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Based on the 4 years (2007–2010) of data from the CloudSat 2B-CLDCLASS-LIDAR product, the European Centre for Medium-Range Weather Forecasts Auxiliary (ECMWF-AUX) product and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) level 2 5 km aerosol layer product, this study investigates the impact of atmospheric dynamics and...
Article
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In this paper, the methods to detect dust based on passive and active measurements from satellites have been summarized. These include the visible and infrared (VIR) method, thermal infrared (TIR) method, microwave polarized index (MPI) method, active lidar-based method, and combined lidar and infrared measurement (CLIM) method. The VIR method can...
Article
Precipitable water vapor (PWV) was retrieved using direct solar irradiance at 938 nm measured by a multifilter rotating shadowband radiometer (MFRSR) at the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) located in the semi-arid area of northwest China from August 2007 to June 2010. Measurement also occurred at Zhangye,...
Article
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A quantitative analysis of cloud fraction, cloud radiative forcing, and cloud radiative heating rate (CRH) of the single-layered cloud (SLC) and the multi-layered cloud (MLC), and their differences is presented, based on the 2B-CLDCLASS-LIDAR and 2B-FLXHR-LIDAR products on the global scale. The CRH at a given atmospheric level is defined as the clo...
Article
To enhance the utility of satellite-derived cloud properties for studying the role of clouds in climate change and the hydrological cycle in semi-arid areas, it is necessary to know their uncertainties. This paper estimates the uncertainties of several cloud properties by comparing those derived over the China Loess Plateau from the MODerate-resolu...
Article
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The impact of Asian dust on the determination of cloud phase is analyzed over dust sources and downwind using cloud phase products from cloud-aerosol lidar and infrared pathfinder satellite observations (CALIPSO), atmospheric infrared sounder (AIRS), moderate resolution imaging spectroradiometer (MODIS), and polarization and anisotropy of reflectan...
Article
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Using 2B-CLDCLASS-LIDAR (radar–lidar) cloud classification and 2B-FLXHR-LIDAR radiation products from CloudSat over 4 years, this study evaluates the co-occurrence frequencies of different cloud types, analyzes their along-track horizontal scales and cloud radiative effects (CREs), and utilizes the vertical distributions of cloud types to evaluate...
Article
East Asia is a major dust source in the world. Mineral dusts in the atmosphere and their interactions with clouds and precipitation have great impacts on regional climate in Asia, where there are large arid and semi-arid regions. In this review paper, we summarize the typical transport paths of East Asian dust, which affect regional and global clim...
Article
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利用2007年3月-2008年2月CloudSat与CALIPSO卫星相结合的云分类产品2B-CLDCLASS-LIDAR数据,分析了中国西部及周边地区云的垂直结构特征。研究结果表明,各地区单层云出现频率均大于多层云,天山山脉、祁连山脉中西段多层云出现频率全年均大于周围地区;所有云的云顶和云底高度在不同高度的出现频率具有明显的区域和季节变化特征,且云顶高度的季节变化较云底高度显著;西北地区各云层高度的季节变化不明显,青藏高原(下称高原)地区各云层高度在冬、夏季反差较大;单层云的平均厚度超过2km,2层云和3层云的厚度基本在1~2km;云层间距以2层云最大,且高原地区云层间距季节变化较西北地区明显;高原南坡夏季冰云出现频率较多,其他地区冬、春季冰云出现较多,除高原南坡外,冬季冰云出现频率均在8...
Article
novel approach for estimating marine boundary layer cloud base height (CBH) is proposed based on calculated boundary layer lapse rates, collocated cloud top height (CTH), cloud top, and ocean surface temperatures from the A-Train satellite constellation. The method takes advantage of the assumption that decreases of temperature within and below wat...
Article
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利用2001−2003, 2007−2008 年兰州市环境保护局环境监测站SO2, NO2, PM10 逐日质量浓度监测资料及同期兰州市气象局的常规气象观测资料, 分析了兰州市空气污染的变化特征, 探讨了SO2, NO2 和PM10质量浓度与气象条件的关系. 结果表明: 兰州市空气质量以良和轻微污染天气状况为主, 空气污染状况呈现冬季加重夏季减轻的年变化特征. 吹东北风不利于污染物稀释扩散, 吹西北风有利于污染物稀释扩散, 降水、相对湿度和风速等气象条件对空气污染状况有显著影响, 另外该市城市热岛效应与空气污染状况有明显相关关系.
Article
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利用2007年1月至2008年12月CLOUDSAT和CALIPSO卫星主动遥感资料分析了我国西北3个典型区域不同云类型的宏观及微观的垂直结构特征。结果表明:黄土高原、祁连山和天山地区的年均总云分数分别为62.8%,65.2%和73.4%;3个区域的积状云在夏秋季节发展旺盛,而层状云在冬春季节占主导地位。云层垂直方向的概率密度分布具有显著的区域和季节变化特征,其峰值位于2~6km之间。各个区域云液态水含量自云底向上有明显的递减趋势,夏季天山和祁连山地区低层具有丰富的云水资源,峰值分别达0.47mg/m3、0.38mg/m3。各个区域的云液态水含量峰值以冬季最小,夏季最大。对应的液态云有效粒子半径平均值位于8~16μm之间。降水云的有效粒子半径随高度上升具有明显的递减趋势,而非降水云则存在较弱...
Article
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The aerosol optical properties and their associated radiative effects are derived from sky-radiometer and surface solar radiation data collected over the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) for the period of March to May (MAM) 2009. The result shows that the seasonal mean aerosol optical depth (AOD) at 500 nm...
Article
Surface energy budget is an important factor in weather and climate processes. To estimate the errors in satellite-retrieved surface radiation budget over the interior of China, instantaneous-footprint surface radiation fluxes from the Terra/Aqua FLASHFlux SSF product are compared with the measurements taken at the Semi-Arid Climate and Environment...
Article
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Dusty cloud properties and radiative forcing over northwestern China (source region) are compared to the same quantities over the northwestern Pacific (downwind region) during the Pacific Dust Experiment (PACDEX; April 2007 to May 2007) using collocated data from three satellites in the A-Train constellation: CALIPSO (Cloud-Aerosol Lidar and Infrar...
Article
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The impacts of clouds and atmospheric aerosols on the terrestrial carbon cycle at semi-arid Loess Plateau in Northwest China are investigated, by using the observation data obtained at the SACOL (Semi-Arid Climate and Environment Observatory of Lanzhou University) site. Daytime (solar elevation angles of larger than 50°) net ecosystem exchange (NEE...
Article
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Based on the scattering properties of nonspherical dust aerosol, a new method is developed for retrieving dust aerosol optical depths of dusty clouds. The dusty clouds are defined as the hybrid system of dust plume and cloud. The new method is based on transmittance measurements from surface-based instruments multi-filter rotating shadowband radiom...
Article
5 [1] A method for estimating fractional sky cover from spectral measurements has been 6 developed. The spectral characteristics of clouds and clear-sky aerosols are utilized to 7 partition sky fraction. As illustrated in our sensitivity study and demonstrated in real 8 measurements, the transmittance ratio at selected wavelengths is insensitive to...
Article
A new method has been developed to retrieve cloud optical depths for optically thin clouds (τ < 10) from the Multifilter Rotating Shadowband Radiometer (MFRSR). On the basis of simultaneous measurements of direct and diffuse radiation from MFRSR, this method allows partition of water and ice clouds and thus improves cloud optical depth retrievals....
Article
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The semi-direct effects of dust aerosols are analyzed over eastern Asia using 2 years (June 2002 to June 2004) of data from the Clouds and the Earth's Radiant Energy System (CERES) scanning radiometer and MODerate Resolution Imaging Spectroradiometer (MODIS) on the Aqua satellite, and 18 years (1984 to 2001) of International Satellite Cloud Climato...
Article
The dusty cloud radiative forcing over the middle latitude regions of East Asia was estimated by using the 2-year (July 2002-June 2004) data of collocated clouds and the Earth' s radiant energy system (CERES) scanner and moderate resolution imaging spectroradiometer (MODIS) from Aqua Edition 1B SSF (single scanner footprint) . The dusty cloud is de...
Article
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利用MODIS AQUA卫星反演和装载在AQUA上的CERES仪器观测资料,讨论了我国北方地区2004年3月26-28日沙尘暴过程中沙尘气溶胶对云物理特性和辐射强迫的影响。初步结果表明,沙尘气溶胶明显改变了云的物理特性,使云滴变小,含水量及光学厚度减少,减弱了云的净辐射强迫,云的冷却效应受到了抑制,相当于大气层顶沙尘气溶胶的增温作用。
Article
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1] The effects of dust storms on cloud properties and Radiative Forcing (RF) are analyzed over Northwestern China from April 2001 to June 2004 using data collected by the MODerate Resolution Imaging Spectroradiometer (MODIS) and Clouds and the Earth's Radiant Energy System (CERES) instruments on the Aqua and Terra satellites. On average, ice cloud...
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利用1983 年7 月至1998 年12 月国际卫星云气候计划ISCCP D2 的月平均云资料, 对西北地 区空中云水资源的时空分布特征进行了系统的研究。结果表明: 三个不同区域的月平均总云量、光学厚度和云水路径的区域平均值分别在52. 5 %~58. 3 % , 2. 6~6. 6 和44. 9~77. 6 g ·m- 2 之间; 西北地区空中云水资源多年平均分布有其沿地形分布的特点, 总云量、中云量、总光学厚度和总云水路径的高值区均在天山、昆仑山、祁连山一带, 而低值中心一般分布在塔里木盆地—内蒙古西部戈壁沙漠—黄土高原西北部一带。此外, 祁连山、青海所在的高原气候区云水资源近年呈上升趋势, 特别是总光学厚度和总云水路径15 年来呈明显上升趋势, 分别约上升了0. 8 和16. 4 g...

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