Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China
Haze pollution in central North China has become a hot topic in recent decades due to its serious environmental and health effects. In this work, the interannual relationship between haze days in December–January (DJ_HD) and leaf area index in August–September (AS_LAI) over central North China, alon...
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ftdoajarticles:oai:doaj.org/article:27a17bd871c24ae4b0e994ae779a4e10 2023-05-15T13:11:22+02:00 Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China Liuqing Ji Ke Fan 2022-02-01T00:00:00Z https://doi.org/10.3390/rs14040884 https://doaj.org/article/27a17bd871c24ae4b0e994ae779a4e10 EN eng MDPI AG https://www.mdpi.com/2072-4292/14/4/884 https://doaj.org/toc/2072-4292 doi:10.3390/rs14040884 2072-4292 https://doaj.org/article/27a17bd871c24ae4b0e994ae779a4e10 Remote Sensing, Vol 14, Iss 884, p 884 (2022) haze days LAI central North China East Asian winter monsoon interannual variability Science Q article 2022 ftdoajarticles https://doi.org/10.3390/rs14040884 2022-12-31T15:26:13Z Haze pollution in central North China has become a hot topic in recent decades due to its serious environmental and health effects. In this work, the interannual relationship between haze days in December–January (DJ_HD) and leaf area index in August–September (AS_LAI) over central North China, along with the possible physical mechanisms involved, are investigated. The relationship varies in different periods, being significant during 1982–2000 (P1) but insignificant during 2001–2014 (P2). During P1, there is an in-phase relationship between AS_LAI and surface evaporation, and an out-of-phase relationship between AS_LAI and surface albedo in August–September. The surface evaporation and albedo anomalies persist to October–November and are associated with lower top-layer volumetric soil water, upward sensible heat flux and downward latent heat flux anomalies in October–November, which act as the bridge in the relationship between AS_LAI and DJ_HD. Both the volumetric soil water and heat fluxes anomalies persist to December–January and correspond to atmospheric circulations similar to the weakened East Asian winter monsoon pattern, which is the dominant system for winter haze events. Thus, the ventilation conditions in December–January are favorable for the accumulation of haze particles. However, during P2, the relationships are not significant between AS_LAI and volumetric soil water or surface soil temperature during October–January. Meanwhile, the East Asian winter monsoon is likely strengthened and tends to be more significantly affected by factors including Arctic sea ice, Arctic Oscillation, etc. Therefore, the effects of AS_LAI on the monsoon may become insignificant and, in turn, the relationship between AS_LAI and DJ_HD becomes insignificant during P2. Article in Journal/Newspaper albedo Arctic Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Remote Sensing 14 4 884 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
haze days LAI central North China East Asian winter monsoon interannual variability Science Q |
spellingShingle |
haze days LAI central North China East Asian winter monsoon interannual variability Science Q Liuqing Ji Ke Fan Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China |
topic_facet |
haze days LAI central North China East Asian winter monsoon interannual variability Science Q |
description |
Haze pollution in central North China has become a hot topic in recent decades due to its serious environmental and health effects. In this work, the interannual relationship between haze days in December–January (DJ_HD) and leaf area index in August–September (AS_LAI) over central North China, along with the possible physical mechanisms involved, are investigated. The relationship varies in different periods, being significant during 1982–2000 (P1) but insignificant during 2001–2014 (P2). During P1, there is an in-phase relationship between AS_LAI and surface evaporation, and an out-of-phase relationship between AS_LAI and surface albedo in August–September. The surface evaporation and albedo anomalies persist to October–November and are associated with lower top-layer volumetric soil water, upward sensible heat flux and downward latent heat flux anomalies in October–November, which act as the bridge in the relationship between AS_LAI and DJ_HD. Both the volumetric soil water and heat fluxes anomalies persist to December–January and correspond to atmospheric circulations similar to the weakened East Asian winter monsoon pattern, which is the dominant system for winter haze events. Thus, the ventilation conditions in December–January are favorable for the accumulation of haze particles. However, during P2, the relationships are not significant between AS_LAI and volumetric soil water or surface soil temperature during October–January. Meanwhile, the East Asian winter monsoon is likely strengthened and tends to be more significantly affected by factors including Arctic sea ice, Arctic Oscillation, etc. Therefore, the effects of AS_LAI on the monsoon may become insignificant and, in turn, the relationship between AS_LAI and DJ_HD becomes insignificant during P2. |
format |
Article in Journal/Newspaper |
author |
Liuqing Ji Ke Fan |
author_facet |
Liuqing Ji Ke Fan |
author_sort |
Liuqing Ji |
title |
Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China |
title_short |
Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China |
title_full |
Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China |
title_fullStr |
Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China |
title_full_unstemmed |
Interannual Relationship between Haze Days in December–January and Satellite-Based Leaf Area Index in August–September over Central North China |
title_sort |
interannual relationship between haze days in december–january and satellite-based leaf area index in august–september over central north china |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/rs14040884 https://doaj.org/article/27a17bd871c24ae4b0e994ae779a4e10 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Sea ice |
genre_facet |
albedo Arctic Sea ice |
op_source |
Remote Sensing, Vol 14, Iss 884, p 884 (2022) |
op_relation |
https://www.mdpi.com/2072-4292/14/4/884 https://doaj.org/toc/2072-4292 doi:10.3390/rs14040884 2072-4292 https://doaj.org/article/27a17bd871c24ae4b0e994ae779a4e10 |
op_doi |
https://doi.org/10.3390/rs14040884 |
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Remote Sensing |
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14 |
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4 |
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884 |
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