| Description: |
Warm-season dead zones-volumes of coastal water containing too little O2 to support macrofauna-are a growing global menace. Trace elements that are deposited in sediments in response to reducing or sulfidic conditions can provide proxy records for reconstructing dead zone evolution. Rhenium becomes only modestly (2-fold) elevated during the 20th century and fails to track the historic record of summertime O2 depletion. In contrast, Molybdenum enrichments do track historic O2 depletion. [Source: Environmental science & technology]
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