Sentences with phrase «rainfall trends in»

Reader Proust points me to this helpful BOM site showing rainfall trends in Australia.

To close things out, here's the promised deeper dive on flood and rainfall trends in the state in the context of global warming.

This is the first paper published that examines rainfall trends in the Sahara across a century.

«Rainfall trends in arid regions buck commonly held climate change theories.»

My point is simply that observations of the actual rainfall trend in recent times are not consistent with CSIRO model projections (I will of course withdraw this comment if my figuring is shown to be wrong).

Not exact matches

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While the trends associated with climate change — hotter days, heavier rainfall and a greater number of extreme weather events — are present in the models, for many crops in Africa and Asia it's not clear how extensive the effects will be.

Moreover, these trends reflected shifts in rainfall in the two areas and not CO2 concentrations.

Even at the time of the last IPCC report in 2007, the trends for extreme heat, droughts and intense rainfall were already clearly upward.

Drs Singer and Michaelides employ STORM to show that the historical rainfall trends likely resulted in less runoff from this dryland basin, an effect they expect to have occurred at many similar basins in the region.

To explore the links between climatic warming and rainfall in drylands, scientists from the Universities of Cardiff and Bristol analysed more than 50 years of detailed rainfall data (measured every minute) from a semi-arid drainage basin in south east Arizona exhibiting an upward trend in temperatures during that period.

Since trends in convective rainfall are not easily detected in daily rainfall records, or well - simulated by global or regional climate models, the researchers created a new tool to assess the effects of climate change on rainfall patterns and trends in dryland areas.

«Many previous studies have documented trends in rainfall in the Sahara and Sahel.

And lastly, although the models get the precipitation trends spot - on, they «significantly underestimate the magnitude of change [in rainfall],» Hegerl admits, explaining that better modeling is near the top of the agenda for the researchers.

The predictions matched actual rainfall measurements during the 75 - year period, both in the magnitude (amount) and the trend (increase or decrease) of precipitation.

Combining the STORM model with analysis of the rainfall data set allowed the investigators to gain insights into decadal trends in monsoonal rainfall intensity under climate change.

Such trends mean scientists and policymakers will have to factor in how synthetic climate forcers other than greenhouse gases will change temperature, rainfall and weather extremes.

«It is difficult to detect trends in rainfall, because the number of storms and the amount of rain in individual storms both vary so much from year to year.

There have been significant regional trends in rainfall with the northern, eastern and southern parts of the continent receiving greater rainfall and the western region receiving less.

Most of the focus has been on the global mean temperature trend in the models and observations (it would certainly be worthwhile to look at some more subtle metrics — rainfall, latitudinal temperature gradients, Hadley circulation etc. but that's beyond the scope of this post).

The team charted trends in rainfall from 1956 to 2005 in eastern China, which has 162 weather stations that provided complete data collected over the entire 50 years.

And note in addition that in addition to the warming, there are strong trends toward decreasing rainfall across the Antipodean continent, which are backed up by tragically decreased river and stream flows, severe water restrictions in most states (starting to ease in some places due to recent floods), and a significantly increased farmer suicide rate.

Given that studies of past climate patterns have found evidence of super-deluges in the Northeast, and that scientists have observed a century - long trend toward more rainfall coming in heavy downpours in the world's temperate zones (a pattern matching what's expected in a greenhouse - heated world), the logic in planning for the worst case in designing everything from a dam to a basement to a rural road is growing ever stronger.

Although there is still some disagreement in the preliminary results (eg the description of polar ice caps), a lot of things appear to be quite robust as the climate models for instance indicate consistent patterns of surface warming and rainfall trends: the models tend to agree on a stronger warming in the Arctic and stronger precipitation changes in the Topics (see crude examples for the SRES A1b scenarios given in Figures 1 & 2; Note, the degrees of freedom varies with latitude, so that the uncertainty of these estimates are greater near the poles).

Most of the focus has been on the global mean temperature trend in the models and observations (it would certainly be worthwhile to look at some more subtle metrics — rainfall, latitudinal temperature gradients, Hadley circulation etc. but that's beyond the scope of this post).

Here we analyze a series of climate model experiments along with observational data to show that the recent warming trend in Atlantic sea surface temperature and the corresponding trans - basin displacements of the main atmospheric pressure centers were key drivers of the observed Walker circulation intensification, eastern Pacific cooling, North American rainfall trends and western Pacific sea - level rise.

In contrast, the daily rainfall variability during July - August shows a statistically significant (5 per cent significance level) increasing trend.

Of course, as they point out «because rainfall is such a variable element, trend values are highly dependent on the start and end dates of the analysis» and the fact they are simply using linear interpolation it is very difficult to derive anything meaningful in terms of climate change from just one map.

John, You say that the BoM map of the trend in rainfall in southeastern Australia since 1970 «demonstrates how much drier the climate has become over the period in which warming has been observed.»

-- Pielke Jr. ignores trends in sea level rise and rainfall, for which strong climate connections exist, and which directly relate to flooding.

For example, despite the 5 - year drought that was recently busted in Oklahoma, most of that state has an upward trend in summer rainfall, further indicating the feast or famine that can come with rainfall in the Plains.

These differences between projected and observed trends in rainfall seem to raise serious questions about the ability of the models to predict changes in rainfall — though Iâ $ ™ d be interested in CSIRO views, especially on whether it is appropriate to use successive 11 - year averages as measures of outcome and, if it is not, how the relationship between projections and outcome should be monitored.

These systems likely contribute to an observed regional trend of increasing extreme rainfall, and poor prediction of them likely contributes to a warm, dry bias in climate models downstream of the Sierras de Córdoba in a key agricultural region.

«In summary, the current assessment concludes that there is not enough evidence at present to suggest more than low confidence in a global - scale observed trend in drought or dryness (lack of rainfall) since the middle of the 20th century.&raquIn summary, the current assessment concludes that there is not enough evidence at present to suggest more than low confidence in a global - scale observed trend in drought or dryness (lack of rainfall) since the middle of the 20th century.&raquin a global - scale observed trend in drought or dryness (lack of rainfall) since the middle of the 20th century.&raquin drought or dryness (lack of rainfall) since the middle of the 20th century.»

Snowfall varies across the region, comprising less than 10 % of total precipitation in the south, to more than half in the north, with as much as two inches of water available in the snowpack at the beginning of spring melt in the northern reaches of the river basins.81 When this amount of snowmelt is combined with heavy rainfall, the resulting flooding can be widespread and catastrophic (see «Cedar Rapids: A Tale of Vulnerability and Response»).82 Historical observations indicate declines in the frequency of high magnitude snowfall years over much of the Midwest, 83 but an increase in lake effect snowfall.61 These divergent trends and their inverse relationships with air temperatures make overall projections of regional impacts of the associated snowmelt extremely difficult.

For example, let's say that evidence convinced me (in a way that I wasn't convinced previously) that all recent changes in land surface temperatures and sea surface temperatures and atmospheric temperatures and deep sea temperatures and sea ice extent and sea ice volume and sea ice density and moisture content in the air and cloud coverage and rainfall and measures of extreme weather were all directly tied to internal natural variability, and that I can now see that as the result of a statistical modeling of the trends as associated with natural phenomena.

Pounds was not deterred by the fact that there was no drying trend in Monteverde's annual, seasonal, or monthly rainfall.

... incomplete and misleading because it 1) omits any mention of several of the most important aspects of the potential relationships between hurricanes and global warming, including rainfall, sea level, and storm surge; 2) leaves the impression that there is no significant connection between recent climate change caused by human activities and hurricane characteristics and impacts; and 3) does not take full account of the significance of recently identified trends and variations in tropical storms in causing impacts as compared to increasing societal vulnerability.

Nor was there any trend in the variability of day?to?day rainfall.

However, as both SLR and increased rainfall are known to happen as a result of warming, perhaps there is an answer in regional basin temperature trends.

Before 1980 natural variability was enough to explain rainfall fluctuations, they said, but they had detected a clear upward trend in the past few decades towards more unprecedented daily rainfall events.

This study, which was supported by the U.S. National Science Foundation, is the first to analyze long - term trends in rainfall and surface air temperature over a timescale of nearly an entire century, the study's lead author, Natalie Thomas, a doctoral candidate in atmospheric and oceanic science at the University of Maryland, told Live Science.

Participating researchers said, in the course of the study, they had noticed «a strengthening trend of winter rainfall (between 1964 - 2006) and summer rainfall (between 1938 - 2006) and weakening monsoon rain (1960 onwards).

Remarkably, the raw data shows between ~ 1870s to 1940s Australia temperature trends did NOT follow world trends, largely as a result of changes in rainfall.

Likewise, general trends toward higher annual maximum daily rainfall are consistent with an overall rise in atmospheric moisture associated with warmer air (7 ⇓ — 9).

The pattern of rainfall over the past century does not point to a trend of reduction in rainfall.

Projections of future rainfall trends are uncertain in this region, despite projected southward shifts in the subtropical ridge and mid-latitude westerlies.

One model showed a 17 - percent increase in extreme rainfall between 1861 and 2017 — quite similar to the trend found in the actual rainfall observations.

The authors assert that the human - caused post-1940s cooling trend and increase in precipitation dramatically conflict with climate model expectations which project a human - caused warming trend and decreasing rainfall with the advent of increasing GHG emissions.

Human activity has caused a significant long - term cooling trend -LRB--0.35 °C between the 1940s and 2009) and higher rainfall totals via the mechanism of «agricultural intensification» — a photosynthesis - associated increase in the air's water vapor or humidity levels due to an explosive (400 %) increase in crop production and yield since the 1940s.