Supplementary material to "Comparison of influence between two types of cold surge on haze dispersion in Eastern China"

Paleogene sediments, especially the third member of the Dongying Formation (Ed3) and the first and third members of the Shahejie Formation (Es1 and Es3), have been regarded as the most important source rocks in the Nanpu Sag. Organic and inorganic analyses, including Rock-Eval pyrolysis, gas chromatography-mass spectrometry, and element geochemistry, in 91 mudstone samples, were used to reconstruct the palaeoenvironmental conditions, such as palaeoclimate, palaeo-salinity and palaeo-redox conditions, and to recognize the origin of organic matter. The results show that Es3 has a higher TOC content than Es1 and Ed3. Hydrocarbon genetic potential (S1 + S2) of the samples indicate fair to good hydrocarbon potential. The kerogen type of Ed3 and Es1 source rocks are Type II1–II2, while Es3 source rocks are dominated by Type II2–III kerogens. Biomarkers and inorganic geochemical indicatives of source rocks, such as Pr/Ph, V/(V + Ni) and Cu/Zn, indicate a lacustrine environment with fresh to brackish water under suboxic to anoxic conditions during deposition. Ed3 source rocks are characterized by low G/C30H (gamacerane/C30hopane) (<0.1), TT/C30H (tricyclic terpane/C30hopane) and S/H (serane/hopane), high Pr/Ph (pristane/phytane) and C24TeT/C23TT (C24tetracyclic terpane/C23tricyclic terpane), indicating mixed input of both algae and terrestrial higher plants, dominated by terrestrial higher plants. Es1 source rocks display medium G/C30H, TT/C30H, S/H, Pr/Ph and C24TeT/C23TT, indicative of a mixed input of both algae and terrestrial higher plants. Es3 source rocks are characterized by high G/C30H (>0.1), TT/C30H and S/H, low Pr/Ph and C24TeT/C23TT, typical of a mixed input of algae and terrestrial higher plants, with algal dominance. Ed3, Es1 and Es3 source rocks were mostly deposited in semi-arid to humid-warm climate conditions, with an average temperature higher than 15°C. This study suggests that suitable temperatures, a fresh to brackish lacustrine environment and suboxic to anoxic conditions could result in a high organic matter concentration and preservation, thus providing prerequisites for the formation of high-quality source rocks.Supplementary material: Tables S1–S3 are available at https://doi.org/10.6084/m9.figshare.c.5227684

Download Full-text

Supplementary material to "Impacts of black carbon on the formation of advection-radiation fog during a haze pollution episode in eastern China"

10.5194/acp-2019-182-supplement ◽

2019 ◽

Author(s):

Qiuji Ding ◽

Jianning Sun ◽

Xin Huang ◽

Aijun Ding ◽

Jun Zou ◽

...

Keyword(s):

Black Carbon ◽

Eastern China ◽

Radiation Fog ◽

Pollution Episode ◽

Haze Pollution ◽

Supplementary Material

Download Full-text

Subseasonal Dynamical Prediction of East Asian Cold Surges

Weather and Forecasting ◽

10.1175/waf-d-16-0209.1 ◽

2017 ◽

Vol 32 (4) ◽

pp. 1675-1694 ◽

Cited By ~ 7

Author(s):

Qiaoping Li ◽

Song Yang ◽

Tongwen Wu ◽

Xiangwen Liu

Keyword(s):

Geopotential Height ◽

Lead Time ◽

Large Scale ◽

Wave Train ◽

East Asian ◽

Eastern China ◽

Northwest Pacific ◽

Cold Surge ◽

Circulation Patterns ◽

Cold Surges

Abstract Predictability of East Asian cold surges is studied using daily data from the hindcasts of 45-day integrations by the NCEP Climate Forecast System version 2 (CFSv2). Prediction skills of the CFSv2 in forecasting cold surges, their annual variation, and their physical links to large-scale atmospheric circulation patterns are examined. Results show that the climatological characteristics of the East Asian winter monsoon can be reasonably reproduced by the CFSv2. The model can well capture the frequency, intensity, and location of cold surges at a lead time of about two weeks. Obviously, fewer-than-observed cold surge days are found in the predictions when the lead time is above 14 days. The spatiotemporal evolutions of high-, mid-, and low-level circulation patterns during cold surge occurrences are all accurately indicated in the CFSv2 prediction. Except for precipitation, the other variables associated with cold surges, such as geopotential height, wind, sea level pressure, and surface air temperature, exhibit higher skills. The lead time of skillful prediction of precipitation is limited to around 1 week, with systematic wet biases over the South China Sea, the Philippine Islands, and the northwest Pacific, but dry biases over India, the Indo-China Peninsula, and most high-latitude regions. Wave train–like patterns of geopotential height and wind differ distinguishably when cold surges occur in northern and southern regions (using 35°N as the dividing line), and the CFSv2 gives a consistent prediction to these anomalous patterns. A weaker-than-observed Siberian high and weaker northerly winds over eastern China are found in the predictions especially at longer lead times.

Download Full-text

Supplementary material to "New eastern China agricultural burning fire emission inventory and trends analysis from combined geostationary (Himawari-8) and polar-orbiting (VIIRS-IM) fire radiative power products"

10.5194/acp-2019-968-supplement ◽

2020 ◽

Author(s):

Tianran Zhang ◽

Mark C. de Jong ◽

Martin J. Wooster ◽

Weidong Xu ◽

Lili Wang

Keyword(s):

Emission Inventory ◽

Eastern China ◽

Trends Analysis ◽

Radiative Power ◽

Agricultural Burning ◽

Supplementary Material ◽

Fire Radiative Power

Download Full-text

Supplementary material to "Dominant Patterns of Summer Ozone Pollution in Eastern China and Associated Atmospheric Circulations"

10.5194/acp-2019-430-supplement ◽

2019 ◽

Author(s):

Zhicong Yin ◽

Bufan Cao ◽

Huijun Wang

Keyword(s):

Eastern China ◽

Ozone Pollution ◽

Atmospheric Circulations ◽

Supplementary Material

Download Full-text

Comparison of the influence of two types of cold surge on haze dispersion in eastern China

Atmospheric Chemistry and Physics ◽

10.5194/acp-21-15185-2021 ◽

2021 ◽

Vol 21 (19) ◽

pp. 15185-15197

Author(s):

Shiyue Zhang ◽

Gang Zeng ◽

Xiaoye Yang ◽

Ruixi Wu ◽

Zhicong Yin

Keyword(s):

Air Quality ◽

Clustering Algorithm ◽

Wave Train ◽

Eastern China ◽

Surface Wind ◽

Surface Air Temperature ◽

Horizontal Surface ◽

Cold Surge ◽

Thermal Inversion ◽

Favorable Weather

Abstract. Cold surge (CS) is considered a favorable weather process to improve air quality and is widely recognized. However, there is no detailed study on the differences in the dispersion ability of different types of CSs in relation to haze days in eastern China (HDEC). This paper uses the hierarchical clustering algorithm to classify the cool-season (November to February of the following year) CSs across eastern China into blocking CSs and wave-train CSs and compares their influences on the number of HDEC from 1980 to 2017. Results show that the wave-train CSs can significantly improve the visibility in eastern China and generally improve air quality for about 2 d longer than the blocking CSs, which indicates that the blocking CSs have a weaker ability to dissipate HDEC compared with the wave-train CSs. The CSs affect the HDEC by changing meteorological elements like thermal inversion potential, horizontal surface wind, sea level pressure (SLP), and surface air temperature (SAT). A period of 4 d after the outbreak of CSs, the variations of thermal inversion potential and horizontal surface wind of two types of CSs tend to be consistent. However, the negative SAT anomalies and the positive SLP anomalies caused by the blocking CSs lasted shorter than those caused by the wave-train CSs, forming favorable conditions for the rapid growth of HDEC. Furthermore, results show that in recent years, especially after the 1990s, the frequency of wave-train CSs has decreased significantly, while the frequency of blocking CSs has slightly increased, indicating that the overall ability of CSs to dissipate HDEC has weakened in general. This work may provide reference for the future formulation of haze control policies in East Asia.

Download Full-text