Influence of ENSO and the Atlantic Multidecadal Oscillation on Drought over the United States

2009 ◽  
Vol 22 (22) ◽  
pp. 5962-5982 ◽  
Author(s):  
Kingtse C. Mo ◽  
Jae-Kyung E. Schemm ◽  
Soo-Hyun Yoo
Keyword(s):  
United States ◽  
North Atlantic ◽  
Atlantic Multidecadal Oscillation ◽  
The United States ◽  
Tropical Pacific ◽  
The North ◽  
The North Atlantic ◽  
The Impact ◽  
Wet Spells ◽  
The Tropical Pacific

Abstract Composites based on observations and model outputs from the Climate Variability and Predictability (CLIVAR) drought experiments were used to examine the impact of El Niño–Southern Oscillation (ENSO) and the Atlantic multidecadal oscillation (AMO) on drought over the United States. Because drought implies persistent dryness, the 6-month standardized precipitation index, standardized runoff index, and soil moisture anomalies are used to represent drought. The experiments were performed by forcing an AGCM with prescribed sea surface temperature anomalies (SSTAs) superimposed on the monthly mean SST climatology. Four model outputs from the NCEP Global Forecast System (GFS), NASA’s Seasonal-to-Interannual Prediction Project, version 1 (NSIPP1), GFDL’s global atmospheric model, version 2.1 (AM2.1), and the Lamont-Doherty Earth Observatory (LDEO)/NCAR Community Climate System Model, version 3 (CCM3) were analyzed in this study. Each run lasts from 36 to 51 yr. The impact of ENSO on drought over the United States is concentrated over the Southwest, the Great Plains, and the lower Colorado River basin, with cold (warm) ENSO events favoring drought (wet spells). Over the East Coast and the Southeast, the impact of ENSO is small because the precipitation responses to ENSO are opposite in sign for winter and summer. For these areas, a prolonged ENSO does not always favor either drought or wet spells. The direct influence of the AMO on drought is small. The major influence of the AMO is to modulate the impact of ENSO on drought. The influence is large when the SSTAs in the tropical Pacific and in the North Atlantic are opposite in phase. A cold (warm) event in a positive (negative) AMO phase amplifies the impact of the cold (warm) ENSO on drought. The ENSO influence on drought is much weaker when the SSTAs in the tropical Pacific and in the North Atlantic are in phase.

scholarly journals Portraying the Impact of the Tibetan Plateau on Global Climate

2020 ◽  
Vol 33 (9) ◽  
pp. 3565-3583 ◽  
Author(s):  
Haijun Yang ◽  
Xingchen Shen ◽  
Jie Yao ◽  
Qin Wen
Keyword(s):  
Tibetan Plateau ◽  
North Atlantic ◽  
Thermohaline Circulation ◽  
Global Climate ◽  
Tropical Pacific ◽  
The Tibetan Plateau ◽  
The North ◽  
The North Atlantic ◽  
The Impact ◽  
The Tropical Pacific

AbstractAs the most extensive highland in the world, the Tibetan Plateau (TP) plays an important role in shaping the global climate. Quantifying the effect of the TP on global climate is the first step for a full understanding of the TP’s standing on planet Earth. Through coupled model sensitivity experiments, we draw a panorama of the TP’s global impact in this paper. Our model results show that the absence of the TP would result in a 4°C colder and 10% drier climate in the Northern Hemisphere (NH). The TP has a striking remote effect on the North Atlantic. Removing the TP would enhance the westerlies in the mid- to high latitudes of the NH and weaken the easterlies over the tropical Pacific. More moisture would be relocated from the tropical Pacific to the North Atlantic, shutting down the Atlantic thermohaline circulation, which would eventually result in more than 15°C colder and 20% drier climate over the North Atlantic. Our model results suggest that the presence of the TP may have contributed greatly to the hospitable modern climate in the NH, by promoting the establishment of the thermohaline circulation in the Atlantic, and therefore enhancing the northward ocean heat transport and atmosphere moisture transport across the equator.

scholarly journals A Critical Evaluation of the Estonian Cyber Incident

2020 ◽  
Vol 1 (2) ◽  
pp. 7-14
Author(s):  
Donald L. Buresh
Keyword(s):  
United States ◽  
European Union ◽  
North Atlantic ◽  
Critical Evaluation ◽  
The United States ◽  
Cyber Attacks ◽  
The European Union ◽  
The North ◽  
The North Atlantic ◽  
The Impact

This paper evaluates the effect of the Estonian cyber incident on Estonia, Russia, the United States, the European Union, and the North Atlantic Treaty Organization, also known as NATO. The paper employs the Valeriano and Maness criteria for evaluating a cyber incident critically. The article asks how did the Estonian cyber incident come to pass, what were the foreign policy and international relationship effects, what was the impact on Estonia, and how did Estonia react to the attack. The essay concludes that the Estonian cyber incident was a catalyst, prompting the nations listed herein to address the effects of cyber-attacks, and then search for acceptable solutions.

Allied High Commission for Germany

1951 ◽  
Vol 5 (4) ◽  
pp. 825-832
Keyword(s):  
United States ◽  
North Atlantic ◽  
Foreign Minister ◽  
The United States ◽  
Scrap Metal ◽  
German Federal Republic ◽  
The North ◽  
The United Kingdom ◽  
The North Atlantic ◽  
Contractual Agreements

With the development of certain administrative frictions (concerning coal quotas, occupation costs, and the scrap metal treaty) between the western occupying powers and the German Federal Republic, early indications were that if the talk of “contractual agreements” did materialize it would reserve, for the occupying powers, wide controls over important areas of west Germany's internal and external affairs. In Washington, however, a general modification of approach was noted during the September discussions between the United States Secretary of State (Acheson), the United Kingdom Foreign Secretary (Morrison), and the French Foreign Minister (Schuman), preparatory to the Ottawa meetings of the North Atlantic Council.

Strategy and the Atlantic Alliance

1963 ◽  
Vol 17 (3) ◽  
pp. 709-732 ◽  
Author(s):  
Robert R. Bowie
Keyword(s):  
United States ◽  
North Atlantic ◽  
North Atlantic Treaty Organization ◽  
The United States ◽  
The North ◽  
Nuclear Control ◽  
The North Atlantic ◽  
The Military

The debate over strategy, forces, and nuclear control, which now divides the North Atlantic Treaty Organization (NATO), is framed largely in military terms: what is the best way to protect the NATO area and its members from aggression? The military aspects are complex in themselves, but the import of these issues extends far beyond defense. Their handling will greatly affect prospects for a partnership between the United States and a strong, united Europe

Shaping the postwar balance of power: multilateralism in NATO

1992 ◽  
Vol 46 (3) ◽  
pp. 633-680 ◽  
Author(s):  
Steve Weber
Keyword(s):  
United States ◽  
Soviet Union ◽  
North Atlantic ◽  
Balance Of Power ◽  
The United States ◽  
The North ◽  
The Soviet Union ◽  
The North Atlantic ◽  
Multilateral Organization ◽  
John Ruggie

At the end of the 1940s, the United States and several West European states allied to defend themselves against invasion by the Soviet Union. Balance-ofpower theory predicts the recurrent formation of such balances among states. But it says little about the precise nature of the balance, the principles on which it will be constructed, or its institutional manifestations. The North Atlantic Treaty Organization (NATO) has been a peculiar mix. As a formal institution, NATO has through most of its history been distinctly nonmultilateral, with the United States commanding most decision-making power and responsibility. At the same time, NATO provided security to its member states in a way that strongly reflected multilateral principles. Within NATO, security was indivisible. It was based on a general organizing principle, the principle that the external boundaries of alliance territory were completely inviolable and that an attack on any border was an attack on all. Diffuse reciprocity was the norm. In the terms set out by John Ruggie, NATO has generally scored low as a multilateral organization but high as an institution of multilateralism.

The Shipping of the North Atlantic Cotton Trade in the Mid-Nineteenth Century

2000 ◽  
Author(s):  
Lars U. Scholl ◽  
Lars U. Scholl ◽  
Lars U. Scholl
Keyword(s):  
United States ◽  
North Atlantic ◽  
The United States ◽  
Southern States ◽  
Atlantic Trade ◽  
The North ◽  
Seasonal Characteristics ◽  
Arrival Dates ◽  
The North Atlantic ◽  
Cotton Trade

This essay analyses the North Atlantic Cotton Trade through records of cotton arrivals at Liverpool, using two sets of data from 1830-1832 and 1853-1855. Using Customs Bills of Entry, Williams presents data of cotton receipts from the United States to Liverpool; quantities of bales exported; numbers of vessels; origin ports of vessels; distinguishes between regular and occasional cotton traders; arrivals at Liverpool by nationality; and vessel tonnage. He determines that the majority of vessels participated in the cotton trade seasonally, and suggests that the cotton trade was not self-contained, but part of a complex interrelationship within the North Atlantic trade system, encompassing commodity dealings, shipping employment levels, and the seasonal characteristics of cargo. The conclusion requests further scholarly research into the pattern of ship movements in the Atlantic. Two appendices provide more data, concerning arrival dates of regular traders in Liverpool, and the month of departure of cotton vessels from Southern states.

Decolonial Theology in the North Atlantic World

2019 ◽  
Vol 3 (3) ◽  
pp. 1-88
Author(s):  
Joseph Drexler-Dreis
Keyword(s):  
United States ◽  
North Atlantic ◽  
Social Transformation ◽  
Atlantic World ◽  
Ways Of Knowing ◽  
The United States ◽  
The North ◽  
The North Atlantic ◽  
Relations Of Power ◽  
General Perspective

Abstract This essay develops a response to the historical situation of the North Atlantic world in general and the United States in particular through theological reflection. It offers an overview of some decolonial perspectives with which theologians can engage, and argues for a general perspective for a decolonial theology as a possible response to modern/colonial structures and relations of power, particularly in the United States. Decolonial theory holds together a set of critical perspectives that seek the end of the modern/colonial world-system and not merely a democratization of its benefits. A decolonial theology, it is argued, critiques how the confinement of knowledge to European traditions has closed possibilities for understanding historical encounters with divinity, and thus possibilities of critical reflection. A decolonial theology reflects critically on a historical situation in light of faith in a divine reality, the understanding of which is liberated from the monopoly of modern/colonial ways of knowing, in order to catalyze social transformation.

scholarly journals Hydrological variations in central China over the past millennium and their links to the tropical Pacific and North Atlantic oceans

2020 ◽  
Vol 16 (2) ◽  
pp. 475-485
Author(s):  
Fucai Duan ◽  
Zhenqiu Zhang ◽  
Yi Wang ◽  
Jianshun Chen ◽  
Zebo Liao ◽  
...  
Keyword(s):  
North Atlantic ◽  
Atmospheric Precipitation ◽  
Tropical Pacific ◽  
Meridional Overturning Circulation ◽  
Central China ◽  
Ice Age ◽  
The North ◽  
Future Global Warming ◽  
The North Atlantic ◽  
The Tropical Pacific

Abstract. Variations of precipitation, also called the Meiyu rain, in the East Asian summer monsoon (EASM) domain during the last millennium could help enlighten the hydrological response to future global warming. Here we present a precisely dated and highly resolved stalagmite δ18O record from the Yongxing Cave, central China. Our new record, combined with a previously published one from the same cave, indicates that the Meiyu rain has changed dramatically in association with the global temperature change. In particular, our record shows that the Meiyu rain was weakened during the Medieval Climate Anomaly (MCA) but intensified during the Little Ice Age (LIA). During the Current Warm Period (CWP), our record indicates a similar weakening of the Meiyu rain. Furthermore, during the MCA and CWP, our records show that the atmospheric precipitation is similarly wet in northern China and similarly dry in central China, but relatively wet during the CWP in southern China. This spatial discrepancy indicates a complicated localized response of the regional precipitation to the anthropogenic forcing. The weakened (intensified) Meiyu rain during the MCA (LIA) matches well with the warm (cold) phases of Northern Hemisphere surface air temperature. This Meiyu rain pattern also corresponds well to the climatic conditions over the tropical Indo-Pacific warm pool. On the other hand, our record shows a strong association with the North Atlantic climate as well. The reduced (increased) Meiyu rain correlates well with positive (negative) phases of the North Atlantic Oscillation. In addition, our record links well to the strong (weak) Atlantic meridional overturning circulation during the MCA (LIA) period. All abovementioned localized correspondences and remote teleconnections on decadal to centennial timescales indicate that the Meiyu rain was coupled closely with oceanic processes in the tropical Pacific and North Atlantic oceans during the MCA and LIA.

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