Bubble-mediated transport is the predominant pathway of methane emissions from inland waters, which are a globally significant sources potent greenhouse gas to atmosphere. High uncertainties exist in emission estimates due high spatial and temporal variability. Acoustic methods have been applied for mapping ebullition rates by quantification rising bubbles water column. However, variability flu...

Two species of carcharhinid sharks aggregate every winter at the warm water effluent a coastal power plant on Israeli Mediterranean coast. The two (Carcharhinus obscurus and Carcharhinus plumbeus) cooccur in highly confined area for several months year are associated with around hot effluent. Niche partitioning has recently been suggested as mechanism that enables coexistence similar shark by r...

We report the synthesis and application of a novel Exfoliated graphite/Selenium-Zinc oxide (EG/Se-ZnO) nanocomposite for photodegradation of methylene blue dye and its antibacterial activity. The composite was characterized using XRD, FTIR, SEM and TEM. Applicability of EG/ Se-ZnO nanocomposite as photocatalyst was investigated by the photocatalytic degradation of methylene blue as a model for ...

Here we present first observations, from instrumentation installed on moorings and a float, of unexpectedly low (< 2 μmolkg) oxygen environments in the open waters of the tropical North Atlantic, a region where oxygen concentration does normally not fall much below 40 μmolkg. The low-oxygen zones are created at shallow depth, just below the mixed layer, in the euphotic zone of cyclonic eddies a...

The bottom depth of coastal benthic habitats plays a vital role in the ecological environment and navigation. In optically shallow waters (OSWs), seafloor reflectance has an impact on remotely sensed data, thus, water can be retrieved from remote sensing (Rrsλ) values provided by satellite imagery. Empirical methods for estimation are mainly limited field measurements coverage. addition, owing ...

Abstract Long waves are generated and transform when short-wave groups propagate into shallow water, but the generation transformation processes not fully understood. In this study we develop an analytical solution to linearized shallow-water equations at wave-group scale, which decomposes long a forced (a bound wave) free solutions (free waves). The relies on hypothesis that continuously as ov...

Experiments were conducted in a laboratory facility under with a fixed bathymetric profile containing a single bar. A hybrid data set was collected consisting of remotely sensed wave data combined with modelgenerated wave amplitude profiles. The data is used to test the improvements in depth retrieval through the use of a nonlinear composite dispersion that is applicable in arbitrary water dept...

Most CMIP5 models unrealistically form Antarctic Bottom Water by open ocean deep convection in the Weddell and Ross Seas. To identify the triggering mechanisms leading to Southern Ocean deep convection in models, we perform sensitivity experiments on the ocean model NEMO forced by prescribed atmospheric fluxes. We vary the ver-5 tical velocity scale of the Langmuir turbulence, the fraction of t...

[1] Methane (CH4) represents a major product of organic matter decomposition in lakes. Once produced in the sediments, CH4 can be either oxidized or emitted as a greenhouse gas to the atmosphere. Lakes represent an important source of atmospheric CH4, but the relative magnitudes of the internal pathways that lead to CH4 emissions are not yet clear. We quantified internal cycling and methane emi...