Journal of Geophysical Research D: Atmospheres

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Estimating global black carbon emissions using a top‐down Kalman Filter approach
Journal of Geophysical Research D: Atmospheres - Tập 119 Số 1 - Trang 307-323 - 2014
Jason Blake Cohen, Chien Wang
AbstractBlack carbon (BC) is an important aerosol constituent in the atmosphere and climate forcer. A good understanding of the radiative forcing of BC and associated climate feedback and response is critical to minimize the uncertainty in predicting current and future climate influenced by anthropogenic aerosols. One reason for this uncertainty is that current emi...... hiện toàn bộ
Impact of inherent meteorology uncertainty on air quality model predictions
Journal of Geophysical Research D: Atmospheres - Tập 120 Số 23 - 2015
Robert C. Gilliam, Christian Hogrefe, James M. Godowitch, Sergey L. Napelenok, Rohit Mathur, S. Trivikrama Rao
AbstractIt is well established that there are a number of different classifications and sources of uncertainties in environmental modeling systems. Air quality models rely on two key inputs, namely, meteorology and emissions. When using air quality models for decision making, it is important to understand how uncertainties in these inputs affect the simulated conce...... hiện toàn bộ
Sulfate Aerosol in the Arctic: Source Attribution and Radiative Forcing
Journal of Geophysical Research D: Atmospheres - Tập 123 Số 3 - Trang 1899-1918 - 2018
Yang Yang, Hailong Wang, Steven J. Smith, R. C. Easter, Philip J. Rasch
AbstractSource attribution of Arctic sulfate and its radiative forcing due to aerosol‐radiation interactions (RFari) for 2010–2014 are quantified in this study using the Community Earth System Model equipped with an explicit sulfur source‐tagging technique. The model roughly reproduces the seasonal pattern of sulfate but has biases in simulating the magnitude of ne...... hiện toàn bộ
An efficient hybrid method for estimating clear‐sky surface downward longwave radiation from MODIS data
Journal of Geophysical Research D: Atmospheres - Tập 122 Số 5 - Trang 2616-2630 - 2017
Jie Cheng, Shunlin Liang, Wenhui Wang, Yamin Guo
AbstractThis paper proposes an efficient hybrid method for estimating 1 km instantaneous clear‐sky surface downward longwave radiation (LWDN) from Moderate Resolution Imaging Spectroradiometer (MODIS) thermal infrared observations and the MODIS near‐infrared column water vapor (CWV) data product. The LWDN was formulated as a nonlinear function of surface upwelling ...... hiện toàn bộ
Role of inertial instability in the West African monsoon jump
Journal of Geophysical Research D: Atmospheres - Tập 120 Số 8 - Trang 3085-3102 - 2015
Kerry H. Cook
AbstractThe West African monsoon jump is a sudden shift in the latitude of the West African precipitation maximum from the Guinean coast near 4°N into Sahel near 12°N in late June or early July. An examination of reanalyses and observations indicates that the Sahel rainy season develops smoothly and the monsoon jump occurs because of an abrupt decrease in Guinean c...... hiện toàn bộ
Introduction to Special Collection: “Bridging Weather and Climate: Subseasonal‐to‐Seasonal (S2S) Prediction”
Journal of Geophysical Research D: Atmospheres - Tập 125 Số 4 - 2020
Alex Lang, Kathy Pegion, Elizabeth A. Barnes
AbstractThis article acts as an introduction to the JGR‐Atmospheres Special Section titled “Bridging Weather and Climate: Subseasonal‐to‐Seasonal (S2S) Prediction”. It outlines the major findings of the articles published in the Special Section as well as discusses organized national and international efforts to advance subseasonal‐to‐seasonal prediction research.<...
In situ observations of black carbon in snow and the corresponding spectral surface albedo reduction
Journal of Geophysical Research D: Atmospheres - Tập 120 Số 4 - Trang 1476-1489 - 2015
Christina A. Pedersen, Jean‐Charles Gallet, J. Ström, Sebastian Gerland, Stephen R. Hudson, Sanja Forsström, Elisabeth Isaksson, Terje K. Berntsen
AbstractBlack carbon (BC) particles emitted from incomplete combustion of fossil fuel and biomass and deposited on snow and ice darken the surface and reduce the surface albedo. Even small initial surface albedo reductions may have larger adjusted effects due to snow morphology changes and changes in the sublimation and snow melt rate. Most of the literature on the...... hiện toàn bộ
High‐speed video observation of stepwise propagation of a natural upward positive leader
Journal of Geophysical Research D: Atmospheres - Tập 121 Số 24 - 2016
Zhichao Wang, Xiushu Qie, Rubin Jiang, Caixia Wang, Gaopeng Lu, Zhuling Sun, Mingyuan Liu, Yunjiao Pu
AbstractUsing a high‐speed video camera operated at 150,000 frames per second, we have documented the upward propagation of an initial positive leader from a 325 m meteorological tower in Beijing. The stepwise development of the upward positive leader was clearly revealed during its self‐sustained propagation toward the cloud base, providing the first optical evide...... hiện toàn bộ
Characteristics and Sources of Hourly Trace Elements in Airborne Fine Particles in Urban Beijing, China
Journal of Geophysical Research D: Atmospheres - Tập 124 Số 21 - Trang 11595-11613 - 2019
Yang Cui, Dongsheng Ji, Hui Chen, Meng Gao, Willy Maenhaut, Jun He, Yuesi Wang
AbstractTo better investigate the characteristics and sources of trace elements (TEs) in PM2.5 in urban Beijing, a 1‐year hourly observation was continuously made using an online multi‐element analyzer from 1 June 2016 to 31 May 2017. The average concentrations of 14 individual TEs ranged from 1.1 (V) to 900 ng/m3 (K). The ...... hiện toàn bộ
Comparing the diurnal and seasonal variabilities of atmospheric and surface urban heat islands based on the Beijing urban meteorological network
Journal of Geophysical Research D: Atmospheres - Tập 122 Số 4 - Trang 2131-2154 - 2017
Kaicun Wang, Shaojing Jiang, Jiankai Wang, Chunlüe Zhou, Xiaoyan Wang, Xuhui Lee
AbstractThis study compared the diurnal and seasonal cycles of atmospheric and surface urban heat islands (UHIs) based on hourly air temperatures (Ta) collected at 65 out of 262 stations in Beijing and land surface temperature (Ts) derived from Moderate Resolution Imagin...... hiện toàn bộ
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