نتایج جستجو برای: lakes and reservoirs
تعداد نتایج: 16833639 فیلتر نتایج به سال:
Globally, lakes are currently accumulating organic carbon (OC) at an estimated annual rate of about 42 Tg·yr. Most of the OC in all but the most oligotrophic of these lakes is autochthonous, produced by primary production in the lakes. The sediments of reservoirs accumulate an additional 160 Tg annually, and peatlands contribute 96 Tg annually. These three carbon pools collectively cover less t...
Volcanic lakes are characterized by physicochemical favorable conditions for the development of reservoirs of C-bearing greenhouse gases that can be dispersed to air during occasional rollover events. By combining a microbiological and geochemical approach, we showed that the chemistry of the CO2- and CH4-rich gas reservoir hosted within the meromictic Lake Averno (Campi Flegrei, southern Italy...
We conducted a study of recreational exposure to microcystins among 81 children and adults planning recreational activities on either of three California reservoirs, two with significant, ongoing blooms of toxin-producing cyanobacteria, including Microcystis aeruginosa (Bloom Lakes), and one without a toxin-producing algal bloom (Control Lake). We analyzed water samples for algal taxonomy, micr...
Runoff from the catchment areas of reservoirs is partly responsible for chemical quality water. The main objective this study was to compare physico-chemical waters four lakes in sub-county Ferkessedougou located north Cote dIvoire. After application referenced analytical methods, contents elements were subjected statistical processing, mainly principal component analysis (PCA). revealed a cate...
Satellite product uncertainty estimates are critical for the further development and evaluation of remote sensing algorithms, as well user community (e.g., modelers, climate scientists, decision-makers). Optical water quality is affected by significant uncertainties stemming from correction atmospheric effects a lack algorithms that can be universally applied to waterbodies spanning several ord...
The physical factors controlling total mercury (HgT) and methylmercury (MeHg) concentrations in lakes and streams of northeastern USA were assessed in a regional data set containing 693 HgT and 385 corresponding MeHg concentrations in surface waters. Multiple regression models using watershed characteristics and climatic variables explained 38% or less of the variance in HgT and MeHg. Land cove...
Chrysosporum ovalisporum is a cylindrospermopsin toxin producing cyanobacterium that was reported in several lakes and reservoirs. Its growth dynamics and toxin distribution in field remain largely undocumented. Chrysosporum ovalisporum was reported in 2009 in Karaoun Reservoir, Lebanon. We investigated the factors controlling the occurrence of this cyanobacterium and vertical distribution of c...
Reducing the magnitude and frequency of peak algal biomass is a common goal of lake management. To better quantify such conditions in Missouri reservoirs, an upper boundary delineating maximum algal chlorophyll (Chlmax) across the range of total phosphorus (TP) was developed using summer monitoring data (n = 8839) and compared with 2 other Missouri datasets (n = 8188 and 5151). Typically, other...
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