Sentences with phrase «lower precipitation years»

In ponderosa pine ecosystems, soil texture is an important factor in forest water stress during lower precipitation years and post-disturbance regeneration (Scianna [2011]-RRB-.

«Warming in California has made it more probable that when a low precipitation year occurs, it occurs in warm conditions and is more likely to produce severe drought,» said lead study author Noah Diffenbaugh, an associate professor in the School of Earth Sciences at Stanford.

These increases in drought risk have occurred despite a lack of substantial change in the occurrence of low or moderately low precipitation years (Figs. 1B and 2 A and B).

Not exact matches

California has been in a drought since 2011 and this multi-year period of low precipitation, by some measures, is the state's most severe in 500 years.

This year's fire risk comes on the heels of a severe drought in eastern and southeastern Brazil, where the satellite data showed a continued reduction in rainfall and a drawdown of groundwater associated with lower than normal precipitation.

The hot and dry weather in the Southern Plains and Lower Mississippi Valley caused an intense short - term drought to develop despite long - term drought being eliminated earlier in the year from heavy spring precipitation.

Spring precipitation as rain or snow can also help to augment years of relatively low winter snow and prevent reduced streamflow.

Although long - term (60 + months) precipitation deficits persisted in some locations, some reservoirs returned to above - average levels after being record and near - record low for the past several years.

Rising temperatures and shifts in precipitation and moisture balance of forests are likely to increase negative direct effects on forests, particularly in water - limited systems and in years with low precipitation.

Precipitation at this time of year is extremely low.

The lake typically rises a bit during winter; this year it rose an impressive 1.2 feet prior to April, largely due to precipitation on the lake and lower - elevation rainfall... [/ blockquote]

Using similar values for winter precipitation and basal area reduction, our model simulated the runoff response to vary depending on years since treatment, from a high of 38 mm (1.5 inches) in the year immediately following treatments to a low approaching zero mm after six years (Figure 3c).

What's interesting is that the blue oak data showed that while precipitation levels in California have been low over the past 3 years, the levels haven't been unprecedented.

A high pressure ridge sitting of California's coast for several years (known as the «Ridiculously Resilient Ridge» for its persistence) has been a primary factor contributing to the low levels of precipitation.

In addition, climate change is very likely to lead to more frequent extreme heat events and daily precipitation extremes over most areas of North America, more frequent low snow years, and shifts towards earlier snowmelt runoff over much of the western US and Canada (high confidence).

In addition to extremely low precipitation, California has also been experiencing exceptional warmth over much of the past year.

There have been years with a dearth of rainfall comparable to the current drought, says Paul Rogers for McClatchy, but the combination of high temperatures and low precipitation is what makes the current drought really stand out.

B) For the ice cores the progressive closing of the diffusion paths between the surface and the «air bubbles» of a layer of the firn is tantamount to a temporal low - pass filter which smoothes the transitions faster than several centuries (in Antarctica where the precipitation of ice is a few mm / year, it's the time it takes for some 50 m of water to accumulate).

[6] Across California, 68 percent of weather station located between 2,000 and 5,000 feet registered a lower percentage of winter precipitation falling as snow, according to 65 years of winter precipitation data.

Correlation (color) and regression maps (contour) of SST (left) and SLP (right) associated with the first EOF modes of annual precipitation (a, b), low - frequency precipitation (c, d), and total water storage (e, f), which are calculated using annual mean data for the first EOF mode of annual precipitation, 10 - year running mean for precipitation, and 10 - year running mean leading with 5 - year for total water storage.

Correlation coefficients are calculated using annual mean data for the first EOF mode of annual precipitation, 10 - year running mean data for the low - frequency precipitation, and 10 - year running mean data leading with 5 - year for the total water storage.

This detectable increase in extremely low - precipitation years adds to the effect of rising temperatures and contributes to the increasing occurrence of extremely warm — dry 12 - mo periods during the 21st century.

Our analyses show that California has historically been more likely to experience drought if precipitation deficits co-occur with warm conditions and that such confluences have increased in recent decades, leading to increases in the fraction of low - precipitation years that yield drought.

All 20 August — July 12 - mo periods that exhibited a — 1.0 SD PMDI anomaly also exhibited a — 0.5 SD precipitation anomaly (Fig. 1B and 2E), suggesting that moderately low precipitation is prerequisite for a 1 - SD drought year.

Although these hydrological changes could potentially increase soil water availability in previously snow - covered regions during the cool low - ET season (34), this effect would likely be outweighed by the influence of warming temperatures (and decreased runoff) during the warm high - ET season (36, 38), as well as by the increasing occurrence of consecutive years with low precipitation and high temperature (Fig. 4A).

For example, ours is an implicit approach that analyzes the temperature and precipitation conditions that have historically occurred with low PMDI years, but does not explicitly explore the physical processes that produce drought.

The event encompasses the lowest calendar - year and 12 - mo precipitation on record (8), and almost every month between December 2011 and September 2014 exhibited multiple indicators of drought (Fig.

One year in the late 1980s in Western Canada crop experts predicted a below average harvest because of low precipitation.

Arid region - A land region of low rainfall, where «low» is widely accepted to be < 250 millimeters (~ 10 inches) precipitation per year.

Our approach in Swain et al. (2014) doesn't allow us to determine whether the amplitude of the flow pattern itself (i.e. its «ridgey - ness») is increasing, nor whether years with extremely low precipitation have become more common.

The findings suggest that California could be entering an era when nearly every year that has low precipitation also has temperatures similar to or higher than 2013 - 14, when the statewide average annual temperature was the warmest on record.

Subarctic Climate Occurs mainly in Northern hemisphere south of Arctic Ocean Winters are long and bitterly cold; summers short and cool Below freezing half the year Tundra Climate Coastal areas along the Arctic Ocean Long, bitterly cold winters In some parts is permafrost, or permanently frozen layers of soil Ice Cap Climate North and South poles Temperature lows of more than - 120 F Snow and ice remain year - round, but little precipitation Highland Climate Found on mountains Includes polar climates plus others; several climates in one As you go up a mountain, temperatures drop and plant life grows sparser.