A diverse influence of dissolved natural organic matter on light irradiance measurements in lakes
Light penetration plays a vital role in lakes and drinking water reservoirs, influencing fundamental processes such as primary production and thermal budgets. The Secchi depth (ZSD) and the compensation depth (ZCD) are commonly used measurements in this context. ZSD is determined through visual insp...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-08-01
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| Series: | Journal of Water and Climate Change |
| Subjects: | |
| Online Access: | http://jwcc.iwaponline.com/content/14/8/2861 |
| _version_ | 1797202742324756480 |
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| author | Ståle Haaland Jonatan Haga Øivind Wien |
| author_facet | Ståle Haaland Jonatan Haga Øivind Wien |
| author_sort | Ståle Haaland |
| collection | DOAJ |
| description | Light penetration plays a vital role in lakes and drinking water reservoirs, influencing fundamental processes such as primary production and thermal budgets. The Secchi depth (ZSD) and the compensation depth (ZCD) are commonly used measurements in this context. ZSD is determined through visual inspection using a Secchi disc, while ZCD represents the depth at which photosynthetic activity balances respiration and can be measured using a quantum irradiance sensor. Through in situ water-core samples from 23 lakes within a lake district in Southeastern Norway, we observed that DNOM exerts a diverse influence on these light irradiance measurements. If DNOM concentrations are reduced to half or a quarter of the current concentration, similar to what was measured during the 1980s, the median ZCD:ZSD ratios are estimated to have decreased by approximately 30 and 60% since then, respectively. Conversely, a plausible future climate-driven doubling or quadrupling of the present DNOM concentrations are estimated to further decrease the median ZCD:ZSD ratios in the lake district with approximately 10 and 25%, respectively. From this, the ZCD:ZSD ratios seem to have experienced a considerable long-term decline attributed to both climate change and the recovery from acid rain, and a further climate-driven decrease is expected.
HIGHLIGHTS
A long-term DNOM decline has had a diverse impact on two classical lake irradiance measurements – Secchi depth (ZSD) and compensation depth (ZCD) measurements.;
Irradiance measurements are affected by parameters scattering and absorbing light.;
ZCD is relatively more affected by DNOM.;
ZSD is relatively more affected by turbidity.;
ZCD:ZSD ratios have had a long-term decrease within a lake district in Norway.; |
| first_indexed | 2024-03-12T01:45:24Z |
| format | Article |
| id | doaj.art-5f55ea56bb234cd9ae12335e0f23e2a5 |
| institution | Directory Open Access Journal |
| issn | 2040-2244 2408-9354 |
| language | English |
| last_indexed | 2024-04-24T08:08:16Z |
| publishDate | 2023-08-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water and Climate Change |
| spelling | doaj.art-5f55ea56bb234cd9ae12335e0f23e2a52024-04-17T08:30:58ZengIWA PublishingJournal of Water and Climate Change2040-22442408-93542023-08-011482861287110.2166/wcc.2023.217217A diverse influence of dissolved natural organic matter on light irradiance measurements in lakesStåle Haaland0Jonatan Haga1Øivind Wien2 Norwegian Institute of Bioeconomy Research, P.O. Box 115, NO-1431 Ås, Norway Indre Østfold, P.O. Box 34, NO-1861 Trøgstad, Norway Sweco, P.O. Box 80 Skøyen, NO-0212 Oslo, Norway Light penetration plays a vital role in lakes and drinking water reservoirs, influencing fundamental processes such as primary production and thermal budgets. The Secchi depth (ZSD) and the compensation depth (ZCD) are commonly used measurements in this context. ZSD is determined through visual inspection using a Secchi disc, while ZCD represents the depth at which photosynthetic activity balances respiration and can be measured using a quantum irradiance sensor. Through in situ water-core samples from 23 lakes within a lake district in Southeastern Norway, we observed that DNOM exerts a diverse influence on these light irradiance measurements. If DNOM concentrations are reduced to half or a quarter of the current concentration, similar to what was measured during the 1980s, the median ZCD:ZSD ratios are estimated to have decreased by approximately 30 and 60% since then, respectively. Conversely, a plausible future climate-driven doubling or quadrupling of the present DNOM concentrations are estimated to further decrease the median ZCD:ZSD ratios in the lake district with approximately 10 and 25%, respectively. From this, the ZCD:ZSD ratios seem to have experienced a considerable long-term decline attributed to both climate change and the recovery from acid rain, and a further climate-driven decrease is expected. HIGHLIGHTS A long-term DNOM decline has had a diverse impact on two classical lake irradiance measurements – Secchi depth (ZSD) and compensation depth (ZCD) measurements.; Irradiance measurements are affected by parameters scattering and absorbing light.; ZCD is relatively more affected by DNOM.; ZSD is relatively more affected by turbidity.; ZCD:ZSD ratios have had a long-term decrease within a lake district in Norway.;http://jwcc.iwaponline.com/content/14/8/2861allochthonous dissolved natural organic matter (dnom)climate changecompensation depth (zcd)par-lightsecchi depth (zsd)water-core samples |
| spellingShingle | Ståle Haaland Jonatan Haga Øivind Wien A diverse influence of dissolved natural organic matter on light irradiance measurements in lakes Journal of Water and Climate Change allochthonous dissolved natural organic matter (dnom) climate change compensation depth (zcd) par-light secchi depth (zsd) water-core samples |
| title | A diverse influence of dissolved natural organic matter on light irradiance measurements in lakes |
| title_full | A diverse influence of dissolved natural organic matter on light irradiance measurements in lakes |
| title_fullStr | A diverse influence of dissolved natural organic matter on light irradiance measurements in lakes |
| title_full_unstemmed | A diverse influence of dissolved natural organic matter on light irradiance measurements in lakes |
| title_short | A diverse influence of dissolved natural organic matter on light irradiance measurements in lakes |
| title_sort | diverse influence of dissolved natural organic matter on light irradiance measurements in lakes |
| topic | allochthonous dissolved natural organic matter (dnom) climate change compensation depth (zcd) par-light secchi depth (zsd) water-core samples |
| url | http://jwcc.iwaponline.com/content/14/8/2861 |
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