Daily Archives: January 17, 2013

The Global Temperature Stand-Still is REAL…..so says James Hansen

The five-year mean global temperature has been flat for the last decade, which we interpret as a combination of natural variability and a slow down in the growth rate of net climate forcing.  –James Hansen et al., 15 January 2013

Dominating role of solar irradiance on tropospheric temperatures

O. Karner. On nonstationarity and antipersistency in global temperature series. Journal of Geophysical Research, VOL. 107, doi:10.1029/2001JD002024, 2002

Statistical analysis is carried out for satellite-based global daily tropospheric andstratospheric temperature anomaly and solar irradiance data sets. Behavior of the series appears to be nonstationary with stationary daily increments. Estimating long-range dependence between the increments reveals a remarkable difference between the two temperature series. Global average tropospheric temperature anomaly behaves similarly to the solar irradiance anomaly. Their daily increments show antipersistency for scales longer than 2 months. The property points at a cumulative negative feedback in the Earth climate system governing the tropospheric variability during the last 22 years. The result emphasizes a dominating role of the solar irradiance variability in variations of the tropospheric temperature and gives no support to the theory of anthropogenic climate change. The global average stratospheric temperature anomaly proceeds like a 1-dim random walk at least up to 11 years, allowing good presentation by means of the autoregressive integrated moving average (ARIMA) models for monthly series.

Click here for full paper (Fee).

Biosorption for defluoridation of drinking water

Aniruddha Ghosh, Kakali Mukherjee, Sumanta K. Ghosh, Bidyut Saha. Sources and toxicity of fluoride in the environment. Res Chem Intermed DOI 10.1007/s11164-012-0841-1

Fluoride, a naturally occurring element, exists in combination with other elements as a fluoride compound, and is found naturally in water, foods, soil, and  several minerals such as fluorite and fluorapatite. Fluoride normally enters the  environment and human body through water, food, industrial exposure, drugs, cosmetics,  etc. However, fluoride (F-) contamination in groundwater has been recognized  as a serious problem worldwide. The World Health Organization’s specified tolerance limit of fluoride in drinking water is 1.5 mg/L. Human disease caused by fluoride manifests itself in three forms: dental, skeletal, and non-skeletal fluorosis.  Apart from teeth and bones, the interaction and involvement of soft tissues, organs, and other systems of the body with fluoride leads to non-skeletal fluorosis. It leads to many bone diseases, mottling of teeth, and lesions of the endocrine glands, thyroid, liver, kidney, and other organs. Fluoride ion concentration in drinking water can be easily estimated by UV-Vis spectrophotometer. Various defluoridation techniques have been developed to reduce the fluoride content to the desired level including principally membrane and adsorption processes. Biosorption is still one of the most extensively used methods for defluoridation of drinking water due to it being cost-free or low cost and because of its viability.