Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales

International audience Long term changes in the water quality of rainfall, cloud water and stream waters draining acidic and acid sensitive moorland and forested catchments at Plynlimon, mid-Wales, are examined for the period 1983 to 2001. Atmospheric inputs of chloride and sulphate are influenced b...

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Main Authors: Neal, C., Reynolds, B., Neal, M., Pugh, B., Hill, L., Wickham, H.
Other Authors: Centre for Ecology and Hydrology (CEH), Natural Environment Research Council (NERC), Centre for Ecology and Hydrology Bangor (CEH)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2001
Subjects:
Online Access:https://hal.science/hal-00304626
https://hal.science/hal-00304626/document
https://hal.science/hal-00304626/file/hess-5-459-2001.pdf
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spelling ftccsdartic:oai:HAL:hal-00304626v1 2023-11-12T04:22:53+01:00 Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales Neal, C. Reynolds, B. Neal, M. Pugh, B. Hill, L. Wickham, H. Centre for Ecology and Hydrology (CEH) Natural Environment Research Council (NERC) Centre for Ecology and Hydrology Bangor (CEH) 2001 https://hal.science/hal-00304626 https://hal.science/hal-00304626/document https://hal.science/hal-00304626/file/hess-5-459-2001.pdf en eng HAL CCSD European Geosciences Union hal-00304626 https://hal.science/hal-00304626 https://hal.science/hal-00304626/document https://hal.science/hal-00304626/file/hess-5-459-2001.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00304626 Hydrology and Earth System Sciences Discussions, 2001, 5 (3), pp.459-476 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2001 ftccsdartic 2023-10-21T23:10:48Z International audience Long term changes in the water quality of rainfall, cloud water and stream waters draining acidic and acid sensitive moorland and forested catchments at Plynlimon, mid-Wales, are examined for the period 1983 to 2001. Atmospheric inputs of chloride and sulphate are influenced by the relative inputs of clean maritime and polluted land based air masses. There is no systematic increase or decrease over time for chloride and non-sea-salt sulphate. Rather, there is a decadal scale process possibly representative of the influence of the North Atlantic Oscillation that affects the maritime and pollution climate of the Atlantic seaboard of the UK. Over 17 years of study, there may be a small decrease in non-sea-salt sulphate of about 10 ?eq l -1 and a small improvement in acid neutralising capacity of about 20 to 30 ?eq l -1 in rainfall. There is a clear improvement in cloud water chemistry with respect to pollutant components (ammonium, nitrate, non-sea-salt sulphate) and acidity (acid neutralising capacity improved by about 300 ?eq l -1 ) through the study period. Many of the changes in cloud water chemistry are similar to rainfall over the same period except the magnitude of change is larger for the cloud water. Within the streams, there is some evidence for reductions in acidity as reflected by acid neutralising capacity becoming less negative. For one stream, deforestation occurred during the sampling period and this led to large increases in nitrate and smaller increases in aluminium midway through the study period. However, the climate and hydrological variability largely masked out other changes. The current analysis provides only a start to identifying trends for such a complex and variable environmental system. The need for strong statistical tools is emphasised to resolve issues of: (a) hydrological induced water quality variability, (b) changing soil and groundwater "endmember" chemistry contribution to the stream and (c) the non-linear patterns of change. Nonetheless, the analysis is ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
institution Open Polar
collection Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
op_collection_id ftccsdartic
language English
topic [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
spellingShingle [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Neal, C.
Reynolds, B.
Neal, M.
Pugh, B.
Hill, L.
Wickham, H.
Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales
topic_facet [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
description International audience Long term changes in the water quality of rainfall, cloud water and stream waters draining acidic and acid sensitive moorland and forested catchments at Plynlimon, mid-Wales, are examined for the period 1983 to 2001. Atmospheric inputs of chloride and sulphate are influenced by the relative inputs of clean maritime and polluted land based air masses. There is no systematic increase or decrease over time for chloride and non-sea-salt sulphate. Rather, there is a decadal scale process possibly representative of the influence of the North Atlantic Oscillation that affects the maritime and pollution climate of the Atlantic seaboard of the UK. Over 17 years of study, there may be a small decrease in non-sea-salt sulphate of about 10 ?eq l -1 and a small improvement in acid neutralising capacity of about 20 to 30 ?eq l -1 in rainfall. There is a clear improvement in cloud water chemistry with respect to pollutant components (ammonium, nitrate, non-sea-salt sulphate) and acidity (acid neutralising capacity improved by about 300 ?eq l -1 ) through the study period. Many of the changes in cloud water chemistry are similar to rainfall over the same period except the magnitude of change is larger for the cloud water. Within the streams, there is some evidence for reductions in acidity as reflected by acid neutralising capacity becoming less negative. For one stream, deforestation occurred during the sampling period and this led to large increases in nitrate and smaller increases in aluminium midway through the study period. However, the climate and hydrological variability largely masked out other changes. The current analysis provides only a start to identifying trends for such a complex and variable environmental system. The need for strong statistical tools is emphasised to resolve issues of: (a) hydrological induced water quality variability, (b) changing soil and groundwater "endmember" chemistry contribution to the stream and (c) the non-linear patterns of change. Nonetheless, the analysis is ...
author2 Centre for Ecology and Hydrology (CEH)
Natural Environment Research Council (NERC)
Centre for Ecology and Hydrology Bangor (CEH)
format Article in Journal/Newspaper
author Neal, C.
Reynolds, B.
Neal, M.
Pugh, B.
Hill, L.
Wickham, H.
author_facet Neal, C.
Reynolds, B.
Neal, M.
Pugh, B.
Hill, L.
Wickham, H.
author_sort Neal, C.
title Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales
title_short Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales
title_full Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales
title_fullStr Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales
title_full_unstemmed Long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at Plynlimon, mid-Wales
title_sort long-term changes in the water quality of rainfall, cloud water and stream water for moorland, forested and clear-felled catchments at plynlimon, mid-wales
publisher HAL CCSD
publishDate 2001
url https://hal.science/hal-00304626
https://hal.science/hal-00304626/document
https://hal.science/hal-00304626/file/hess-5-459-2001.pdf
genre North Atlantic
North Atlantic oscillation
genre_facet North Atlantic
North Atlantic oscillation
op_source ISSN: 1812-2108
EISSN: 1812-2116
Hydrology and Earth System Sciences Discussions
https://hal.science/hal-00304626
Hydrology and Earth System Sciences Discussions, 2001, 5 (3), pp.459-476
op_relation hal-00304626
https://hal.science/hal-00304626
https://hal.science/hal-00304626/document
https://hal.science/hal-00304626/file/hess-5-459-2001.pdf
op_rights info:eu-repo/semantics/OpenAccess
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