Editing IPCC:AR6/WGI/Chapter-8 (section)

===== 8.4.1.7.2 Seasonal snow cover =====

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The AR5 assessed as ''very likely'' that the amount and seasonal duration of Northern Hemisphere (NH) snow cover will reduce under global warming (AR5 Sections 11.3.4.2 and 12.4.6.2). Changes in the total amount of water in the snow cover (snow water equivalent) are less certain because of the competing influences of temperature and precipitation.

As snow cover is assessed in [[IPCC:Wg1:Chapter:Chapter-9|Chapter 9]] ( [[IPCC:Wg1:Chapter:Chapter-9#9.5.3.3|Section 9.5.3.3]] ), only an overview of that assessment is provided here. Changes in seasonality of snow cover are assessed in Box 8.2. The continued consistency of reported results across all generations of model projections, along with improvements in process understanding, has increased confidence in snow cover projections since AR5.

In summary, based on the results of Chapter 9, it is now ''virtually certain'' that future NH snow cover extent and duration will continue to decrease with global warming. While most studies have focused on the NH, process understanding suggests with ''high confidence'' that these results apply to the Southern Hemisphere (SH) as well. There is ''high confidence'' in snowmelt occurring earlier in the year. Changes to the timing and amount of snowmelt will have a strong influence on all the other aspects of the water cycle in regions with seasonal snow, including run-off, soil moisture, and evapotranspiration.

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