An investigation of reduced western disturbance activity over Northwest India in November - December 2015 compared to 2014 - A case study

Basu, S.; Bieniek, Peter A.; Deoras, Akshay

doi:10.1007/s13143-017-0006-7

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…Winter precipitation is found to be more at higher altitudes as compared to lower altitudes. During his research done in 2015 low presipitation is recorded in November and December month lead to bad effect to winter crop and more air pollution in city [9]. Decreasing trend is seen in frequency of WDs over Himachal Pradesh in his research of time period 1997-2007 [10].…”

Section: Rainfall Behavior In the Areamentioning

confidence: 93%

Landslide Killing Himalayas: Collective Study on Causal Factors and Possible Remedies

Khanduri

Verma

2020

ARASET

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Soil is naturally available material used for construction all over the world. When this material available in form of natural slope can cause landslide. Purpose of this study is to understand behavior of different causal factor of landslide at Himachal Pradesh and then suggest some remedial measure. To fulfill this, aim five-year data of precipitation for every district is collected from metrological department and analyzed. Data of earthquake activities is also collected. Work done by different author in this area is analyzed thoroughly. It is found that the change in climatic conditions such as increase in precipitation over years, earthquakes and anthropogenic interference has increased the landslide susceptibility of area. Remedial measure suggested as use of landslide susceptibility zonation map future land use pattern, use of advance technology like soil nail and gabion wall and use of numerical modeling to analyze slope stability.

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Section: Rainfall Behavior In the Areamentioning

confidence: 93%

Landslide Killing Himalayas: Collective Study on Causal Factors and Possible Remedies

Khanduri

Verma

2020

ARASET

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“…Some WDs bring precipitation and rapid surface wind‐speed in the IGP thus modulating air quality (Pawar et al., 2015). For instance, low WD activity in December 2015 likely contributed to extremely high air pollution in New Delhi (Basu et al., 2017). Following Midhuna et al.…”

Section: Change In Local Meteorology With Climate Change and Implicat...mentioning

confidence: 99%

“…Some WDs bring precipitation and rapid surface wind-speed in the IGP thus modulating air quality (Pawar et al, 2015). For instance, low WD activity in December 2015 likely contributed to extremely high air pollution in New Delhi (Basu et al, 2017). Following Midhuna et al (2020) we diagnose the change in WD activity using the Western disturbance index (WDI), the difference in geopotential heights between 850 and 200 hPa over the region 25-40°N 60-80°E.…”

Section: Change In Local Meteorology With Climate Change and Implicat...mentioning

confidence: 99%

Reduction in Near‐Surface Wind Speeds With Increasing CO₂ May Worsen Winter Air Quality in the Indo‐Gangetic Plain

Paulot

Naik

Horowitz

2022

Geophysical Research Letters

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We analyze the relationship between fine particulate matter (PM2.5) and meteorology in winter in the Indo‐Gangetic Plain (IGP). We find that the concentration of PM2.5 exhibits similar increase with decreasing surface wind speed in 15 out of 18 cities considered. Using this observed relationship, we estimate that the reduction of surface wind speed with increasing CO2 simulated by models participating in the Coupled Model Intercomparison Project Phase 6 will result in higher average wintertime PM2.5 concentrations (1% per degree K of global warming) and more frequent high‐pollution events. This observation‐based estimate is qualitatively consistent with the simulated response of black carbon to global warming inferred from the AerChemMIP ssp370SST and ssp370pdSST experiments. We hypothesize that a reduction in the frequency and intensity of western disturbances with increasing CO2 may contribute to the reduction in the surface wind in the IGP.

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“…Devi et al (2020) constructed a simple seasonal forecast model to predict winter precipitation over the Western Himalaya and found a strong negative correlation with the NAO (− 0.57). Basu et al (2017) attributed a weak 2015 winter monsoon to reduced WD activity caused by positive phases of ENSO and the NAO, stating that the positive NAO set up an unfavourable standing wave in the subtropical jet with a blocking anticyclonic anomaly over the subcontinent. Using plankton-based proxies, Munz et al (2017) showed that intense winter monsoons since 1750 coincided with strong negative phases of the NAO.…”

Section: Introductionmentioning

confidence: 99%

Linking the North Atlantic Oscillation to winter precipitation over the Western Himalaya through disturbances of the subtropical jet

Hunt

Zaz

2022

Clim Dyn

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Winter (December to March) precipitation is vital to the agriculture and water security of the Western Himalaya. This precipitation is largely brought to the region by extratropical systems, known as western disturbances (WDs), which are embedded in the subtropical jet. In this study, using seventy years of data, it is shown that during positive phases of the North Atlantic Oscillation (NAO+) the subtropical jet is significantly more intense than during negative phases (NAO−). Accordingly, it is shown that the NAO significantly affects WD behaviour on interannual timescales: during NAO+ periods, WDs are on average 20% more common and 7% more intense than during NAO− periods. This results in 40% more moisture flux entering the region and impinging on the Western Himalaya and an average increase in winter precipitation of 45% in NAO+ compared to NAO−. Using empirical orthogonal function (EOF) analysis, North Atlantic variability is causally linked to precipitation over North India—latitudinal variation in the jet over the North Atlantic is linked to waviness downstream, whereas variation in its tilt over the North Atlantic is linked to its strength and shear downstream. These results are used to construct a simple linear model that can skilfully predict winter precipitation over north India at a lead time of one month.

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An investigation of reduced western disturbance activity over Northwest India in November - December 2015 compared to 2014 - A case study

Cited by 9 publications

References 21 publications

Landslide Killing Himalayas: Collective Study on Causal Factors and Possible Remedies

Landslide Killing Himalayas: Collective Study on Causal Factors and Possible Remedies

Reduction in Near‐Surface Wind Speeds With Increasing CO₂ May Worsen Winter Air Quality in the Indo‐Gangetic Plain

Linking the North Atlantic Oscillation to winter precipitation over the Western Himalaya through disturbances of the subtropical jet

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An investigation of reduced western disturbance activity over Northwest India in November - December 2015 compared to 2014 - A case study

Cited by 9 publications

References 21 publications

Landslide Killing Himalayas: Collective Study on Causal Factors and Possible Remedies

Landslide Killing Himalayas: Collective Study on Causal Factors and Possible Remedies

Reduction in Near‐Surface Wind Speeds With Increasing CO2 May Worsen Winter Air Quality in the Indo‐Gangetic Plain

Linking the North Atlantic Oscillation to winter precipitation over the Western Himalaya through disturbances of the subtropical jet

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Product

Resources

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Reduction in Near‐Surface Wind Speeds With Increasing CO₂ May Worsen Winter Air Quality in the Indo‐Gangetic Plain