Search results for: Hengchi Lei

Items from 1 to 20 out of 24 results

article

Microphysical Characteristics of Precipitation during Pre-monsoon, Monsoon, and Post-monsoon Periods over the South China Sea

Qingwei Zeng, Yun Zhang, Hengchi Lei, Yanqiong Xie, more

Advances in Atmospheric Sciences > 2019 > 36 > 10 > 1103-1120

Raindrop size distribution (RSD) characteristics over the South China Sea (SCS) are examined with onboard Parsivel disdrometer measurements collected during marine surveys from 2012 to 2016. The observed rainfall is divided into pre-monsoon, monsoon, and post-monsoon periods based on the different large-scale circumstances. In addition to disdrometer data, sounding observation, FY-2E satellite, SPRINTARS...

article

Impact of Soil Moisture Uncertainty on Summertime Short-range Ensemble Forecasts

Jiangshan Zhu, Fanyou Kong, Xiao-Ming Hu, Yan Guo, more

Advances in Atmospheric Sciences > 2018 > 35 > 7 > 839-852

To investigate the impact of soil moisture uncertainty on summertime short-range ensemble forecasts (SREFs), a fivemember SREF experiment with perturbed initial soil moisture (ISM) was performed over a northern China domain in summertime from July to August 2014. Five soil moisture analyses from three different operational/research centers were used as the ISM for the ensemble. The ISM perturbation...

article

Microphysical processes of a stratiform precipitation event over eastern China: analysis using micro rain radar data

Hong Wang, Hengchi Lei, Jiefan Yang

Advances in Atmospheric Sciences > 2017 > 34 > 12 > 1472-1482

Data collected using the micro rain radar (MRR) situated in Jinan city, eastern China, were used to explore the altitudinal and temporal evolution of rainfall microphysical characteristics, and to analyze the bright band (BB) characteristics and hydrometeor classification. Specifically, a low-intensity and stable stratiform precipitation event that occurred from 0000 to 0550 UTC 15 February 2015 and...

article

Airborne observations of cloud condensation nuclei spectra and aerosols over East Inner Mongolia

Jiefan Yang, Hengchi Lei, Yuhuan Lü

Advances in Atmospheric Sciences > 2017 > 34 > 8 > 1003-1016

A set of vertical profiles of aerosol number concentrations, size distributions and cloud condensation nuclei (CCN) spectra was observed using a passive cloud and aerosol spectrometer (PCASP) and cloud condensation nuclei counter, over the Tongliao area, East Inner Mongolia, China. The results showed that the average aerosol number concentration in this region was much lower than that in heavily polluted...

article

Aircraft measurements of cloud–aerosol interaction over East Inner Mongolia

Yuhuan Lü, Hengchi Lei, Jiefan Yang

Advances in Atmospheric Sciences > 2017 > 34 > 8 > 983-992

To investigate the potential effects of aerosols on the microphysical properties of warm clouds, airborne observational data collected from 2009 to 2011 in Tongliao, Inner Mongolia, China, were statistically analyzed in this study. The results demonstrated that the vertical distribution of the aerosol number concentration (N_a) was similar to that of the clean rural continent. The average aerosol effective...

article

Observational evidence of high ice concentration in a shallow convective cloud embedded in stratiform cloud over North China

Jiefan Yang, Hengchi Lei, Tuanjie Hou

Advances in Atmospheric Sciences > 2017 > 34 > 4 > 509-520

In this study we observed the microphysical properties, including the vertical and horizontal distributions of ice particles, liquid water content and ice habit, in different regions of a slightly supercooled stratiform cloud. Using aircraft instrument and radar data, the cloud top temperature was recorded as higher than −15°C, behind a cold front, on 9 September 2015 in North China. During the flight...

article

Investigation of riming within mixed-phase stratiform clouds using Weather Research and Forecasting (WRF) model

Tuanjie Hou, Hengchi Lei, Jiefan Yang, Zhaoxia Hu, more

Atmospheric Research > 2016 > 178-179 > C > 291-303

In this study, we investigated stratiform precipitation associated with an upper-level westerly trough and a cold front over northern China between 30 Apr. and 1 May 2009. We employed the Weather Research and Forecasting (WRF) model (version 3.4.1) to perform high-resolution numerical simulations of rainfall. We also conducted simulations with two microphysics schemes and sensitivity experiments without...

chapter

Reflectivity calibration for X-band solid-state radar with metal sphere

Zhaoming Li, Hongbin Chen, Shu Duan, Yongheng Bi, more

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) > 4765 - 4768

IGARSS 2016 - 2016 IEEE International Geoscience and Remote Sensing Symposium

Calibration of weather radar has a direct impact on the accuracy of measurements and therefore is critical for most applications. In this paper, we will focus on reflectivity calibration of X-band solid-state radar. Two test points are selected and three kinds of sphere are used to conduct calibration, including metal and foil. The predicted Z and measured Z_m have a mean bias of 2.1dB. Three combinations...

article

In situ observations of snow particle size distributions over a cold frontal rainband within an extratropical cyclone

Jiefan Yang, Hengchi Lei

Asia-Pacific Journal of Atmospheric Sciences > 2016 > 52 > 1 > 51-62

Cloud microphysical properties of a mixed phase cloud generated by a typical extratropical cyclone in the Tongliao area, Inner Mongolia on 3 May 2014, are analyzed primarily using in situ flight observation data. This study is mainly focused on ice crystal concentration, supercooled cloud water content, and vertical distributions of fit parameters of snow particle size distributions (PSDs). The results...

article

Evaluation of radar and automatic weather station data assimilation for a heavy rainfall event in southern China

Tuanjie Hou, Fanyou Kong, Xunlai Chen, Hengchi Lei, more

Advances in Atmospheric Sciences > 2015 > 32 > 7 > 967-978

To improve the accuracy of short-term (0–12 h) forecasts of severe weather in southern China, a real-time storm-scale forecasting system, the Hourly Assimilation and Prediction System (HAPS), has been implemented in Shenzhen, China. The forecasting system is characterized by combining the Advanced Research Weather Research and Forecasting (WRF-ARW) model and the Advanced Regional Prediction System...

article

Origin of non-spherical particles in the boundary layer over Beijing, China: based on balloon-borne observations

Bin Chen, Maromu Yamada, Yasunobu Iwasaka, Daizhou Zhang, more

Environmental Geochemistry and Health > 2015 > 37 > 5 > 791-800

Vertical structures of aerosols from the ground to about 1,000 m altitude in Beijing were measured with a balloon-borne optical particle counter. The results showed that, in hazy days, there were inversions at approximately 500–600 m, below which the particulate matters were well mixed vertically, while the concentration of particles decreased sharply above the mixing layer. Electron microscopic observation...

article

Particle size spectra and possible mechanisms of high ice concentration in nimbostratus over Hebei Province, China

Jiefan Yang, Hengchi Lei, Zhaoxia Hu, Tuanjie Hou

Atmospheric Research > 2014 > 142 > Complete > 79-90

By employing the three-aircraft measurements combined with Radar and satellite imageries, microphysical structures of a nimbostratus cloud caused by a westerly trough in Zhangjiakou City, Hebei Province on May 1, 2009 are analyzed in this paper, focusing on vertical distribution of PSD (particle size distribution) and the 2D imagery at a variety of altitudes and temperatures. PSD generally appeared...

article

Observed microphysical structure of nimbostratus in northeast cold vortex over China

Zhen Zhao, Hengchi Lei

Atmospheric Research > 2014 > 142 > Complete > 91-99

Airborne measurements were collected during a stepwise ascent within a nimbostratus cloud associated with a northeast cold vortex in Jilin Province over China on 20 June 2005 to study cloud structure and ice particle spectra. The microphysical structure of the nimbostratus was elucidated by King liquid water probe and Particle Measuring Systems (PMS) probes aboard the research aircraft. The PMS 2D...

article

A methodological study on using weather research and forecasting (WRF) model outputs to drive a one-dimensional cloud model

Ling Jin, Fanyou Kong, Hengchi Lei, Zhaoxia Hu

Advances in Atmospheric Sciences > 2014 > 31 > 1 > 230-240

A new method for driving a One-Dimensional Stratiform Cold (1DSC) cloud model with Weather Research and Forecasting (WRF) model outputs was developed by conducting numerical experiments for a typical large-scale stratiform rainfall event that took place on 4–5 July 2004 in Changchun, China. Sensitivity test results suggested that, with hydrometeor profiles extracted from the WRF outputs as the initial...

article

Aircraft observations of liquid and ice in midlatitude mixed-phase clouds

Zhen Zhao, Hengchi Lei

Advances in Atmospheric Sciences > 2014 > 31 > 3 > 604-610

This paper reports airborne measurements of midlatitude altostratus clouds observed over Zhengzhou, Henan Province, China on 3 March 2007. The case demonstrates mixed-phase conditions at altitudes from 3200 to 4600 m (0°C to −7.6°C), with liquid water content ranging from 0.01 to 0.09 g m⁻³. In the observed mixed-phase cloud, liquid water content exhibited a bimodal distribution, whereas the maximum...

article

A regional ensemble forecast system for stratiform precipitation events in the Northern China Region. Part II: Seasonal evaluation for summer 2010

Jiangshan Zhu, Fanyou Kong, Hengchi Lei

Advances in Atmospheric Sciences > 2013 > 30 > 1 > 15-28

In this study, the Institute of Atmospheric Physics, Chinese Academy of Sciences — regional ensemble forecast system (IAP-REFS) described in Part I was further validated through a 65-day experiment using the summer season of 2010. The verification results show that IAP-REFS is skillful for quantitative precipitation forecasts (QPF) and probabilistic QPF, but it has a systematic bias in forecasting...

chapter

Design of host computer software for cloud particle measurement system

Ruili Jiao, Chao Li, Jiatian Chen, Hengchi Lei

2012 9th International Conference on Fuzzy Systems and Knowledge Discovery > 2905 - 2908

2012 9th International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

This paper studies the design of host computer software for cloud particle measurement system. It includes data communication, data storage, RLE (Run Length Encoding) decompression, system environment variables and image display of particle data. The difficulties are the software architecture design and tri-channel data communication realization. The software has been implemented with the state machine...

article

A regional ensemble forecast system for stratiform precipitation events in northern China. Part I: A case study

Jiangshan Zhu, Fanyou Kong, Hengchi Lei

Advances in Atmospheric Sciences > 2012 > 29 > 1 > 201-216

A single-model, short-range, ensemble forecasting system (Institute of Atmospheric Physics, Regional Ensemble Forecast System, IAP REFS) with 15-km grid spacing, configured with multiple initial conditions, multiple lateral boundary conditions, and multiple physics parameterizations with 11 ensemble members, was developed using the Weather and Research Forecasting Model Advanced Research modeling...

article

Vertical distributions of non-methane hydrocarbons and halocarbons in the lower troposphere over northeast China

Likun Xue, Tao Wang, Isobel. J. Simpson, Aijun Ding, more

Atmospheric Environment > 2011 > 45 > 36 > 6501-6509

Vertical distributions of air pollutants are crucial for understanding the key processes of atmospheric transport and for evaluating chemical transport models. In this paper, we present measurements of non-methane hydrocarbons (NMHCs) and halocarbons obtained from an intensive aircraft study over northeast (NE) China in summer 2007. Most compounds exhibited a typical negative profile of decreasing...

article

A comparative study of the microstructure and precipitation mechanisms for two stratiform clouds in China

Tuanjie Hou, Hengchi Lei, Zhaoxia Hu

Atmospheric Research > 2010 > 96 > 2-3 > 447-460

The microphysics and precipitation mechanisms of two precipitating stratiform clouds on 1 July 2004 (case 040701) and 21 June 2005 (case 050621) were studied by using aircraft and Doppler radar measurements, and precipitation data. Observations showed that the two clouds were characterized by predominantly altostratus and stratocumulus clouds and showing evident radar bright bands at the mature stages...

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Search results for: Hengchi Lei

Microphysical Characteristics of Precipitation during Pre-monsoon, Monsoon, and Post-monsoon Periods over the South China Sea

Impact of Soil Moisture Uncertainty on Summertime Short-range Ensemble Forecasts

Microphysical processes of a stratiform precipitation event over eastern China: analysis using micro rain radar data

Airborne observations of cloud condensation nuclei spectra and aerosols over East Inner Mongolia

Aircraft measurements of cloud–aerosol interaction over East Inner Mongolia

Observational evidence of high ice concentration in a shallow convective cloud embedded in stratiform cloud over North China

Investigation of riming within mixed-phase stratiform clouds using Weather Research and Forecasting (WRF) model

Reflectivity calibration for X-band solid-state radar with metal sphere

In situ observations of snow particle size distributions over a cold frontal rainband within an extratropical cyclone

Evaluation of radar and automatic weather station data assimilation for a heavy rainfall event in southern China

Origin of non-spherical particles in the boundary layer over Beijing, China: based on balloon-borne observations

Particle size spectra and possible mechanisms of high ice concentration in nimbostratus over Hebei Province, China

Observed microphysical structure of nimbostratus in northeast cold vortex over China

A methodological study on using weather research and forecasting (WRF) model outputs to drive a one-dimensional cloud model

Aircraft observations of liquid and ice in midlatitude mixed-phase clouds

A regional ensemble forecast system for stratiform precipitation events in the Northern China Region. Part II: Seasonal evaluation for summer 2010

Design of host computer software for cloud particle measurement system

A regional ensemble forecast system for stratiform precipitation events in northern China. Part I: A case study

Vertical distributions of non-methane hydrocarbons and halocarbons in the lower troposphere over northeast China

A comparative study of the microstructure and precipitation mechanisms for two stratiform clouds in China

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