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Aerosol observations above the Southern Ocean and Antarctic sea ice are scarce. Measurements of aerosols and atmospheric composition were made in East Antarctic pack ice on-board the Australian icebreaker Aurora Australis during the spring of 2012.
Bromine explosion events that occur over first year sea ice in the polar spring cause mercury deposition and dramatically alter the oxidative capacity of the polar boundary layer. Atmospheric chemical measurements made during the Sea Ice Physics and Ecosystems eXperiment (SIPEX II)…
Tropospheric ozone is a greenhouse gas, ranked third in anthropogenic radiative forcing after CO2 and CH4. Ozone in the troposphere makes up an important fraction of the atmospheric shield against ultraviolet … radiation particularly when stratospheric ozone depletion events occur.
Tropospheric … ozone … is … a … greenhouse … gas, ranked … third … in … anthropogenic … radiative … forcing … after … CO2 … and … CH4.
A second orchid species, Nematoceras … sulcatum M.A.Clem. et D.L.Jones, has been found on … subantarctic Macquarie Island. A history of its discovery … and recognition is provided. The morphology, biology and ecology of the new species are compared … with N. dienemum (D.L.Jones) D.L.Jones, M.A.Clem.