{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:01:46Z","timestamp":1760144506033,"version":"build-2065373602"},"reference-count":65,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2024,4,11]],"date-time":"2024-04-11T00:00:00Z","timestamp":1712793600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005753","name":"Royal Physiographic Society of Lund","doi-asserted-by":"publisher","award":["161116","2018-00430","2017-00772","2018-04111"],"award-info":[{"award-number":["161116","2018-00430","2017-00772","2018-04111"]}],"id":[{"id":"10.13039\/501100005753","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Ministry of Higher Education","award":["161116","2018-00430","2017-00772","2018-04111"],"award-info":[{"award-number":["161116","2018-00430","2017-00772","2018-04111"]}]},{"DOI":"10.13039\/501100004359","name":"Swedish Research Council","doi-asserted-by":"publisher","award":["161116","2018-00430","2017-00772","2018-04111"],"award-info":[{"award-number":["161116","2018-00430","2017-00772","2018-04111"]}],"id":[{"id":"10.13039\/501100004359","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001862","name":"FORMAS","doi-asserted-by":"publisher","award":["161116","2018-00430","2017-00772","2018-04111"],"award-info":[{"award-number":["161116","2018-00430","2017-00772","2018-04111"]}],"id":[{"id":"10.13039\/501100001862","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004359","name":"Swedish Research Council VR","doi-asserted-by":"publisher","award":["161116","2018-00430","2017-00772","2018-04111"],"award-info":[{"award-number":["161116","2018-00430","2017-00772","2018-04111"]}],"id":[{"id":"10.13039\/501100004359","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The concentration of colored dissolved organic matter (CDOM) in lakes is strongly influenced by climate, land cover, and topographic settings, but it is not known how drought may affect the relative importance of these controls. Here, we evaluate the controls of CDOM during two summers with strongly contrasting values of the Palmer drought index (PDI), indicating wet vs. dry conditions. We hypothesized that lake CDOM during a wet summer season is regulated mainly by the surrounding land cover to which the lakes are hydrologically connected, while, during drought, the lakes are disconnected from the catchment and CDOM is regulated by climatic and morphometric factors that govern the internal turnover of CDOM in the lakes. A suite of climate, land cover, and morphometric variables was assembled and used to explain remotely sensed CDOM values for 255 boreal lakes distributed across broad environmental and geographic gradients in Sweden and Norway. We found that PDI explained the variability in CDOM among lakes in a dry year, but not in a wet year, and that severe drought strongly decreased CDOM during the dry year. Large lakes, especially, with a presumed high degree of catchment uncoupling, showed low CDOM during the dry year. However, in disagreement with our hypothesis, climate, land cover, and morphometry all showed a stronger impact on lake CDOM in wet vs. dry years. Thus, drought systematically weakened the predictability of CDOM variations at the same time as CDOM was offset toward lower values. Our results show that drought not only has a direct effect on CDOM, but also acts indirectly by changing the spatial regulation of CDOM in boreal lakes.<\/jats:p>","DOI":"10.3390\/rs16081345","type":"journal-article","created":{"date-parts":[[2024,4,11]],"date-time":"2024-04-11T07:09:28Z","timestamp":1712819368000},"page":"1345","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Drought Offsets the Controls on Colored Dissolved Organic Matter in Lakes"],"prefix":"10.3390","volume":"16","author":[{"given":"Enass Said.","family":"Al-Kharusi","sequence":"first","affiliation":[{"name":"Department of Physical Geography and Ecosystem Science, Lund University, S\u00f6lvegatan 12, 22362 Lund, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6511-7224","authenticated-orcid":false,"given":"Geert","family":"Hensgens","sequence":"additional","affiliation":[{"name":"Department of Physical Geography and Ecosystem Science, Lund University, S\u00f6lvegatan 12, 22362 Lund, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6486-8747","authenticated-orcid":false,"given":"Abdulhakim M.","family":"Abdi","sequence":"additional","affiliation":[{"name":"Center for Environmental and Climate Research, Lund University, S\u00f6lvegatan 37, 22362 Lund, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9679-1422","authenticated-orcid":false,"given":"Tiit","family":"Kutser","sequence":"additional","affiliation":[{"name":"Estonian Marine Institute, University of Tartu, M\u00e4ealuse 14, 12618 Tallinn, Estonia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5730-0694","authenticated-orcid":false,"given":"Jan","family":"Karlsson","sequence":"additional","affiliation":[{"name":"Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science, Linnaeus v\u00e4g 6, 90187 Ume\u00e5, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7735-6502","authenticated-orcid":false,"given":"David E.","family":"Tenenbaum","sequence":"additional","affiliation":[{"name":"Department of Physical Geography and Ecosystem Science, Lund University, S\u00f6lvegatan 12, 22362 Lund, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0657-0971","authenticated-orcid":false,"given":"Martin","family":"Berggren","sequence":"additional","affiliation":[{"name":"Department of Physical Geography and Ecosystem Science, Lund University, S\u00f6lvegatan 12, 22362 Lund, Sweden"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"199","DOI":"10.1016\/j.rse.2014.04.033","article-title":"Factors affecting the measurement of CDOM by remote sensing of optically complex inland waters","volume":"157","author":"Brezonik","year":"2015","journal-title":"Remote Sens. 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