Response of terrestrial ecosystems to recent Northern Hemispheric drought

Lotsch, Alexander; Friedl, M. A.; Anderson, Bruce T.; Tucker, Compton J.

doi:10.1029/2004gl022043

Cited by 117 publications

(72 citation statements)

References 28 publications

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“…This pattern is similar to that for NDVI 8 (Lotsch et al 2005). Figure 3 displays changes in (a) P 6-8 , and (b) NDVI 8 , from 1998 (pre-drought year) to 1999 (drought year), and those (d and e) from 2002 (drought year) to 2003 (post-drought year).…”

Section: Resultsmentioning

confidence: 48%

“…A steep drying trend has been observed in soil moisture index values over Northern Hemisphere land areas since the mid-1950s, especially across northern Africa, Canada, Alaska, and Eurasia, including Mongolia (Dai et al 2004;Nandintsetseg and Shinoda 2012). In particular, below-normal precipitation in the Northern Hemisphere during 1999-2002 appears to have extensively decreased vegetation activity over Eurasia and North America, as revealed by the satellite-estimated normalized difference vegetation index (NDVI) (Lotsch et al 2005). The present work focuses on the 4-year, below-normal precipitation period of [1999][2000][2001][2002].…”

Section: Introductionmentioning

confidence: 99%

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Hotspots of recent drought in Asian steppes

Shinoda

Nandintsetseg²,

Nachinshonhor

et al. 2013

Reg Environ Change

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The present study aims to identify hotspots on the Asian steppe that were vulnerable to widespread drought events in the Northern Hemisphere during 1999-2002, using newly proposed indices of vegetation response (sensitivity and resilience) to drought. Drought sensitivity is defined as vegetation response to decreased precipitation from pre-drought to drought phases, and resilience is defined as response to increased precipitation from drought to post-drought phases. Thus, the sensitivity and resiliency indices SI and RI are similarly expressed as normalized change of vegetation relative to that of precipitation. We also develop new regionally adjusted indices SI r and RI r , to do an interregional comparison of vegetation dynamics. In general, the resilience (RI r or RI) was larger than sensitivity (SI r or SI) over the entire region, whereas they had similar amplitudes over a wetter region (forest steppe). This asymmetric response of SI r \ RI r , which manifested over the desert steppe/steppe regions, is explained by interannual change of plant species composition (i.e., larger ratio of annual/perennial species for the post-drought year of 2003). As for the steppe region, the Chinese section had much higher resilience during the post-drought year compared with the Mongolian one. This may be attributable to the larger annual/perennial ratio, but is not strongly related to grazing pressure. Spatial and temporal analyses of the indices identified locations where there was not resilience from drought-affected vegetation conditions despite increased precipitation, and/or where long-term stability of vegetation is under threat.

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Section: Resultsmentioning

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Hotspots of recent drought in Asian steppes

Shinoda

Nandintsetseg²,

Nachinshonhor

et al. 2013

Reg Environ Change

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show abstract

“…This suggests that soil and land surface conditions were more vulnerable to dust outbreaks in the 2000s than in the 1990s. A drying trendevident in an analysis of the Palmer Drought Severity Index (PDSI) (Dai et al 2004;Dai 2010), reduced precipitation, greater potential evapotranspiration owing to increased air temperature, and reduced normalized difference vegetation index (NDVI) in the 2000s (Lotsch 2005;Kurosaki et al 2011)-supports the demonstrated reduction in threshold wind speed in Mongolia.…”

Section: Introductionmentioning

confidence: 92%

Effects of Soil and Land Surface Conditions in Summer on Dust Outbreaks in the Following Spring in a Mongolian Grassland

Kurosaki

Shinoda

Mikami³

et al. 2011

SOLA

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“…Many researches have investigated NDVI trends in different regions, showing that despite great spatial heterogeneity, NDVI generally increased in national and regional scale in China [19,28], North America [2], east Asia [29] and Euraisa [30]. However, the increasing trends in these areas have slowed down or reversed since mid-1990s, which could be attributed to slowed down temperature trends or more frequent and severe drought [29,31]. The change in NDVI trends were analyzed by comparing trends before and after certain change points.…”

Section: Introductionmentioning

confidence: 99%

Responses of Natural Vegetation Dynamics to Climate Drivers in China from 1982 to 2011

Liu

Lei

2015

Remote Sensing

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This study investigated the spatiotemporal variation of vegetation growth and the influence of climatic drivers from 1982 to 2011 across China using datasets from the Normalized Difference Vegetation Index (NDVI) and climatic drivers. Long term trends, significance and abrupt change points of interannual NDVI time series were analyzed. We applied both simple regression and multi-regression models to quantify the effects of climatic drivers on vegetation growth and compare their relative contributions. Results show that on average, the growing season NDVI significantly increased by 0.0007 year −1 , with 76.5% of the research area showed increasing NDVI from 1982 to 2011. Seasonally, NDVI increased at high rates during the spring and autumn while changed slightly during the summer. At a national scale, the growing season NDVI was significantly and positively correlated to temperature and precipitation, with temperature being the dominant factor. At regional scales, the growing season NDVI was dominated by increasing temperature in most forest-covered areas in southern China and dominated by precipitation in most grassland in northern China. Within the past three decades, the increasing trend of national mean NDVI abruptly changed in 1994, slowing down from 0.0008 year −1 to 0.0003 year −1 . To be regional specific, the growing season NDVI in forest covered southern China has accelerated together with temperature since mid 1990s, while parts of the grassland in northern China have undergone stalled NDVI trends corresponding to slowed temperature increment and dropped precipitation since around 2000. Typical region analysis suggested that apart from

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Response of terrestrial ecosystems to recent Northern Hemispheric drought

Cited by 117 publications

References 28 publications

Hotspots of recent drought in Asian steppes

Hotspots of recent drought in Asian steppes

Effects of Soil and Land Surface Conditions in Summer on Dust Outbreaks in the Following Spring in a Mongolian Grassland

Responses of Natural Vegetation Dynamics to Climate Drivers in China from 1982 to 2011

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