People and the sea change the climate of North America over the past 50 years

Greenhouse gases play an important role in the climate of North America, the temperature differences of marine areas may be the key to predicting future regional climate changes in the United States, according to the assessment. New science directed by NOAA. This assessment is one of the synthesis reports run by the US Climate Change Science Program.

Latest assessment, Analysis of historical climate data on important climate characteristics: the cause of observed changes, describe what has changed - and why - in the North American climate in The past half century. This assessment indicates the ability and scope of human activity and natural changes that alter surface temperatures, precipitation, drought, and flooding.

Randall Dole, principal author and scientist of NOAA's Earth System Research Laboratory in Boulder, Colo, said: 'The main meaning of this assessment is to improve the predictions of surface temperature. sea ​​surface will be crucial in predicting climate change across the United States for many years or decades, and regional climate change in the long run. '

Some temperature zones increase sharply, while others remain the same, the impact of worsening droughts, and a wide range of scams - all in the continent's warmer climatic conditions.

Changing the temperature of the sea surface can play an important role in determining the direction of regional temperature changes in the United States. This also contributes to changes in precipitation over the years or over decades in the past 50 years. (Photo: NOAA)

Changing the temperature of the sea surface can play an important role in determining the direction of regional temperature changes in the United States.This also contributes to changes in precipitation over the years or over decades in the past 50 years.

With the general trend of warmer sea conditions and the increase of greenhouse gases, the difference in sea surface temperatures can be created by humans or naturally.

The review found that the increase in greenhouse gases is responsible for more than half of the continent's warming of 1.6 degrees F over the past 50 years.Greenhouse gases, released from burning fossil fuels and natural sources, keep the heat inside the Earth's atmosphere and warm the surface.

The effects of drought become more severe when the surface temperature gets warmer, the evaporation increases, the moisture of the soil decreases and creates water problems. Scientists do not find long-term trends about where and how often droughts occur, and average annual rainfall and snowfall .

The review also describes in detail how climate scientists use huge amounts of data in effective ways to assess past climates, called 're-analysis'. Another part illustrates their exploration of cause and effect relationships to find the cause for a weather trend, a prolonged drought, or an unusually hot year, called regulation.

In re-analysis, a high-quality climate record is built from past observations collected over a period of time from different observation systems and combined with a climate model. Reanalysis data, now extending back to the mid-20th century, are important in helping scientists understand the development of the weather.

Martin Hoerling, a scientist at NOAA and working at the Earth System Research Laboratory and author of the report, said: 'Using re-analysis and attribution, we can get determine more firmly what has affected climate conditions in the past few years: whether it is global warming, El Niño, La Niña, or other cycles. That is the information that planners and the public are interested in.

NOAA explores and predicts changes in the Earth's environment, from the deep ocean floor to the Sun's surface, while preserving and controlling land and sea resources.