Daily Archives: July 26, 2014

Unstated bias in sea-level rise signal paper

If enough assumptions are made in models just about anything can be linked to anything else. A common unstated bias is assuming a phenomena is anthropogenic. It can certainly be assumed but such an assumption should be clearly state when no evidence is provided to support the claim.

B. D. Hamlington, M. W. Strassburg, R. R. Leben. W. Han, R. S. Nerem, K-Y. Kim. Uncovering an anthropogenic sea-level rise signal in the Pacific Ocean. Nature Climate Change (2014) DOI:doi:10.1038/nclimate2307

Iternal climate variability across a range of scales is known to contribute to regional sea-level trends1, 2, 3, 4, 5, 6, 7, which can be much larger than the global mean sea-level trend in many parts of the globe. Over decadal timescales, this internal variability obscures the long-term sea-level change3, 6, 8, making it difficult to assess the effect of anthropogenic warming on sea level. Here, an attempt is made to uncover the sea-level rise pattern in the tropical Pacific Ocean associated with anthropogenic warming. More specifically, the sea-level variability associated with the Pacific Decadal Oscillation is estimated and removed from the regional sea-level trends computed from satellite altimetry measurements over the past two decades. The resulting pattern of regional sea-level rise uncovered in the tropical Pacific Ocean is explained in part by warming in the tropical Indian Ocean, which has been attributed to anthropogenic warming9. This study represents one of the first attempts at linking the sea-level trend pattern observed by satellite altimetry to anthropogenic forcing.

Click here for full paper (fee).

Acetochlor in source water and drinking water, China’s major cities

Yu ZY, Jin F, Li HY, An W, Yang M. Residual levels of acetochlor in source water and drinking water of china’s major cities. Huan Jing Ke Xue. 2014 May;35(5):1694-7. [Article in Chinese]

The concentration levels of acetochlor were investigated in source water and drinking water from 36 major cities in China by solid phase extraction (SPE) combined with gas chromatography – mass spectrometry (GC-MS). Acetochlor detection rate was 66.9% in all the 145 source water samples collected with an average concentration of 33.9 ng L-1. The average removal rate of acetochlor was limited through the drinking water treatment process. The detection concentration of the northeast region was the highest. The concentrations of acetochlor detected in lake were higher than those in river and groundwater as source water. The detection rate and concentration of Liaohe river watershed and the coastal watershed were the highest.