Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997
International audience Surveys of 485 lakes in Norway conducted in 1986 and again in 1995 reveal widespread chemical recovery from acidification. Sulphate concentrations in lakes have decreased by 40% in acidified areas in southern Norway. This decrease has been compensated about 25% by decreases in...
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ftccsdartic:oai:HAL:hal-00304588v1 2023-11-12T04:23:18+01:00 Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 Skjelkvåle, B. L. Wright, R. F. Henriksen, A. Norwegian Institute for Water Research (NIVA) 1998 https://hal.science/hal-00304588 https://hal.science/hal-00304588/document https://hal.science/hal-00304588/file/hess-2-555-1998.pdf en eng HAL CCSD European Geosciences Union hal-00304588 https://hal.science/hal-00304588 https://hal.science/hal-00304588/document https://hal.science/hal-00304588/file/hess-2-555-1998.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00304588 Hydrology and Earth System Sciences Discussions, 1998, 2 (4), pp.555-562 [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 1998 ftccsdartic 2023-10-21T23:10:54Z International audience Surveys of 485 lakes in Norway conducted in 1986 and again in 1995 reveal widespread chemical recovery from acidification. Sulphate concentrations in lakes have decreased by 40% in acidified areas in southern Norway. This decrease has been compensated about 25% by decreases in concentrations of base cations and of 75% by increased Acid Neutralising Capacity (ANC). The increased ANC in turn reflects lower concentrations of acidic cations Aluminum (AL n+ ) and Hydrogen (H + ). A sub-set of 78 of the 485 lakes sampled yearly between 1986 and 1997 shows that, at first most of the decrease in non-marine sulphate (SO 4 * ) was compensated by a decrease in base cations, such that ANC remained unchanged. Then as SO 4 * continued to decrease, the concentrations of non- marine calcium and magnesium ((Ca+Mg) * ) levelled out. Consequently, ANC increased, and H + and Al n+ started to decrease. In eastern Norway, this shift occurred in 1989?90, and came slightly later in southern and western Norway. Similar shifts in trends in about 1991?92 can also be seen in the non-acidified areas in central and northern Norway. This shift in trends is not as pronounced in western Norway, perhaps because of the confounding influence of sea-salt episodes on water chemistry. This is the first documented national-scale recovery from acidification due to reduced acid deposition. Future climate warming and potentially increased N-leaching can counteract the positive trends in recovery from acidification. Article in Journal/Newspaper Northern Norway Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Norway |
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 Skjelkvåle, B. L. Wright, R. F. Henriksen, A. Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 |
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 Surveys of 485 lakes in Norway conducted in 1986 and again in 1995 reveal widespread chemical recovery from acidification. Sulphate concentrations in lakes have decreased by 40% in acidified areas in southern Norway. This decrease has been compensated about 25% by decreases in concentrations of base cations and of 75% by increased Acid Neutralising Capacity (ANC). The increased ANC in turn reflects lower concentrations of acidic cations Aluminum (AL n+ ) and Hydrogen (H + ). A sub-set of 78 of the 485 lakes sampled yearly between 1986 and 1997 shows that, at first most of the decrease in non-marine sulphate (SO 4 * ) was compensated by a decrease in base cations, such that ANC remained unchanged. Then as SO 4 * continued to decrease, the concentrations of non- marine calcium and magnesium ((Ca+Mg) * ) levelled out. Consequently, ANC increased, and H + and Al n+ started to decrease. In eastern Norway, this shift occurred in 1989?90, and came slightly later in southern and western Norway. Similar shifts in trends in about 1991?92 can also be seen in the non-acidified areas in central and northern Norway. This shift in trends is not as pronounced in western Norway, perhaps because of the confounding influence of sea-salt episodes on water chemistry. This is the first documented national-scale recovery from acidification due to reduced acid deposition. Future climate warming and potentially increased N-leaching can counteract the positive trends in recovery from acidification. |
author2 |
Norwegian Institute for Water Research (NIVA) |
format |
Article in Journal/Newspaper |
author |
Skjelkvåle, B. L. Wright, R. F. Henriksen, A. |
author_facet |
Skjelkvåle, B. L. Wright, R. F. Henriksen, A. |
author_sort |
Skjelkvåle, B. L. |
title |
Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 |
title_short |
Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 |
title_full |
Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 |
title_fullStr |
Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 |
title_full_unstemmed |
Norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 |
title_sort |
norwegian lakes show widespread recovery from acidification; results from national surveys of lakewater chemistry 1986-1997 |
publisher |
HAL CCSD |
publishDate |
1998 |
url |
https://hal.science/hal-00304588 https://hal.science/hal-00304588/document https://hal.science/hal-00304588/file/hess-2-555-1998.pdf |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
ISSN: 1812-2108 EISSN: 1812-2116 Hydrology and Earth System Sciences Discussions https://hal.science/hal-00304588 Hydrology and Earth System Sciences Discussions, 1998, 2 (4), pp.555-562 |
op_relation |
hal-00304588 https://hal.science/hal-00304588 https://hal.science/hal-00304588/document https://hal.science/hal-00304588/file/hess-2-555-1998.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782338123144888320 |