Enable Block: 

Nearly 50% of terrigenous materials delivered to the world's oceans are delivered through just twenty-one major river systems. These river-dominated coastal margins (including estuarine and shelf ecosystems) are thus important both to the regional enhancement of productivity and to the global flux of C that is observed in land-margin ecosystems. The tropical regions of the biosphere are the most biogeochemically active coastal regions and represent potentially important sinks of C in the biosphere.

Observations made during the 1987 El Niño show that in the upper range of sea surface temperatures, the greenhouse effect increases with surface temperature at a rate which exceeds the rate at which radiation is being emitted from the surface. In response to this 'super greenhouse effect', highly reflective cirrus clouds are produced which act like a
thermostat, shielding the ocean from solar radiation. The regulatory effect of these cirrus clouds may limit sea surface temperatures to less than 305 K.

The UN sponsored discussions to prepare a global convention on climate began in February in USA. The aim is to prepare a legally binding convention to curb gaseous emissions leading to a much feared climate destabilisation. This convention is being seen as the world's greatest commitment to the environment and its future generations.

The idea that developing countries like India and China must share the blame for heating up the earth and destablising its climate, as espoused in a recent study published in the United States by the WRI in collaboration with the UN, is an excellent example of environmental colonialism. The report of the WRI is based less on science and more on politically motivated and mathematical jugglery.

Records of hemispheric average temperatures from land regions for the past 100 years provide crucial input to the debate over global warming.

Leaf fall and reproductive phenology of Avicennia marina assessed during 1982-83 using litter fall collections from twenty-five sites in Australia, Papua New Guinea and New Zealand revealed major trends with latitude. Flowering shifted from NovemberDecember in northern tropical sites, to May-June in southern temperate sites. Periods between flowering and fruiting increased from two to three months in tropical sites to ten months in southernmost sites. Leaf fall was more variable with unimodal annual peaks in temperate sites and often multimodal patterns in the tropics.

The study of climate and climate change is hindered by a lack of information on the effect of clouds on the radiation balance of the earth, referred to as the cloud-radiative forcing. Quantitative estimates of the global distributions of cloud-radiative forcing have been obtained from the spaceborne Earth Radiation Budget Experiment (ERBE) launched in
1984.

Pushkar, near Ajmer, Rajasthan, lies in the dry zone to the east of the Indian desert. In the vicinity there is evidence for three arid phases, during the latter part of the Pleistocene, each represented by a major sand sheet and fossil desert dunes. The earliest contains lenses of detritus which include rolled Lower Palaeolithic tools.

An animated short film on greenhouse gas emissions.

Together with the Potsdam Institute for Climate Impact Research (PIK), the Urban Complexity Lab of the University of Applied Sciences Potsdam (FHP) developed an animated short movie that visualizes the carbon dioxide (CO2) emissions of the past – and the possible future.

 

An animated short film on greenhouse gas emissions.
Together with the Potsdam Institute for Climate Impact Research (PIK), the Urban Complexity Lab of the University of Applied Sciences Potsdam (FHP) developed an animated short movie that visualizes the carbon dioxide (CO2) emissions of the past – and the possible future.

Pages