论文信息 - No evidence of continuously advanced green-up dates in the Tibetan Plateau over the last decade

No evidence of continuously advanced green-up dates in the Tibetan Plateau over the last decade

Zhang et al. (1) report that the green-up dates in the Tibetan Plateau (TP) have continuously advanced from 1982 to 2011. They retrieved green-up dates from the multiannual time-series of Normalized Difference Vegetation Index (NDVI) using the method proposed by Piao et al. (2). This method assumes that the nongrowing season NDVI values remain constant among the different years and thus requires sophisticated preprocess of the nongrowing season NDVI. Otherwise, the retrieved green-up dates by the step of polynomial fitting will be negatively biased (i.e., advanced) by the increase in the nongrowing season NDVI (Fig. 1A).

[1] Mingjun Ding,et al. Spatiotemporal variation in alpine grassland phenology in the Qinghai-Tibetan Plateau from 1999 to 2009 , 2013 .

[2] P. Ciais,et al. Variations in satellite‐derived phenology in China's temperate vegetation , 2006 .

[3] Eike Luedeling,et al. Winter and spring warming result in delayed spring phenology on the Tibetan Plateau , 2010, Proceedings of the National Academy of Sciences.

[4] Miaogen Shen,et al. Spring phenology was not consistently related to winter warming on the Tibetan Plateau , 2011, Proceedings of the National Academy of Sciences.

[5] Jinwei Dong,et al. Green-up dates in the Tibetan Plateau have continuously advanced from 1982 to 2011 , 2013, Proceedings of the National Academy of Sciences.