The Sydney Cyprus Survey Project: An Interdisciplinary Investigation of Long-Term Change in the North Central Troodos, Cyprus

1999 ◽  
Vol 26 (1) ◽  
pp. 19 ◽  
Author(s):  
Michael Given ◽  
A. Bernard Knapp ◽  
Nathan Meyer ◽  
Timothy E. Gregory ◽  
Vasiliki Kassianidou ◽  
...  
Keyword(s):  
North Central ◽  
The North ◽  
Term Change

The Sydney Cyprus Survey Project: An Interdisciplinary Investigation of Long-Term Change in the North Central Troodos, Cyprus

1999 ◽  
Vol 26 (1) ◽  
pp. 19-39 ◽  
Author(s):  
Michael Given ◽  
A. Bernard Knapp ◽  
Nathan Meyer ◽  
Timothy E. Gregory ◽  
Vasiliki Kassianidou ◽  
...  
Keyword(s):  
North Central ◽  
The North ◽  
Term Change

Enhanced Seasonal Exchange of CO2 by Northern Ecosystems Since 1960

Science ◽  
2013 ◽  
Vol 341 (6150) ◽  
pp. 1085-1089 ◽  
Author(s):  
H. D. Graven ◽  
R. F. Keeling ◽  
S. C. Piper ◽  
P. K. Patra ◽  
B. B. Stephens ◽  
...  
Keyword(s):  
Boreal Forests ◽  
Atmospheric Carbon Dioxide ◽  
Ecosystem Models ◽  
The North ◽  
Ecological Changes ◽  
Term Change ◽  
Major Shift ◽  
Underlying Mechanisms ◽  
Global Carbon

Seasonal variations of atmospheric carbon dioxide (CO2) in the Northern Hemisphere have increased since the 1950s, but sparse observations have prevented a clear assessment of the patterns of long-term change and the underlying mechanisms. We compare recent aircraft-based observations of CO2 above the North Pacific and Arctic Oceans to earlier data from 1958 to 1961 and find that the seasonal amplitude at altitudes of 3 to 6 km increased by 50% for 45° to 90°N but by less than 25% for 10° to 45°N. An increase of 30 to 60% in the seasonal exchange of CO2 by northern extratropical land ecosystems, focused on boreal forests, is implicated, substantially more than simulated by current land ecosystem models. The observations appear to signal large ecological changes in northern forests and a major shift in the global carbon cycle.

Agricultural Drought in North-Central Mexico

2005 ◽  
Author(s):  
José Alfredo Rodríguez-Pineda ◽  
Lorrain Giddings
Keyword(s):  
Agricultural Land ◽  
Agricultural Drought ◽  
Natural Phenomenon ◽  
North Central ◽  
Water Policies ◽  
The North ◽  
Time Period ◽  
Northern Half ◽  
The Government

Drought is the most significant natural phenomenon that affects the agriculture of northern Mexico. The more drought-prone areas in Mexico fall in the northern half of the country, in the states of Chihuahua, Coahuila, Durango, Zacatecas, and Aguascalientes (figure 10.1). The north-central states form part of the Altiplanicie Mexicana and account for 30.7% of the national territory of 1,959,248 km2. This area is characterized by dry and semidry climates (Garcia, 1981) and recurrent drought periods. The climate of Mexico varies from very dry to subhumid. Very dry climate covers 21%, dry climate covers 28%, and temperate subhumid and hot subhumid climates prevail in 21% and 23% of the national territory, respectively. About 20 years ago, almost 75% of Mexico’s agricultural land was rainfed, and only 25% irrigated (Toledo et al., 1985), making the ratio of rainfed to irrigated area equal to 3. However, for the northern states this ratio was 3.5 during the 1990–98 period (table 10.1). Because of higher percentage of rain-fed agriculture, drought is a common phenomenon in this region, which has turned thousands of hectares of land into desert. Though the government has built dams, reservoirs, and other irrigation systems to alleviate drought effects, rain-fed agriculture (or dryland farming) remains the major form of cultivation in Mexico. In Mexico, there is no standard definition for agricultural drought. However, the Comisión Nacional del Agua (CNA; i.e., National Water Commission), which is a federal agency responsible for making water policies, has coined its own definition for drought. This agency determines whether a particular region has been affected by drought, by studying rainfall records collected from the national climatic network. The national climatic network is spread throughout the country and is managed by the Servicio Meteorológico Nacional (SMN; i.e., National Meteorological Services). The CNA determines, for a municipal region, if the rainfall is equal to or less than one standard deviation from the long-term mean over a time period of two or more consecutive months. If it is, then the secretary of state declares drought for the region.

Increasing anthropogenic nitrogen in the North Pacific Ocean

Science ◽  
2014 ◽  
Vol 346 (6213) ◽  
pp. 1102-1106 ◽  
Author(s):  
Il-Nam Kim ◽  
Kitack Lee ◽  
Nicolas Gruber ◽  
David M. Karl ◽  
John L. Bullister ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Limited Region ◽  
The North ◽  
Term Change ◽  
Rate Of Increase ◽  
Anthropogenic Nitrogen ◽  
The North Pacific

The recent increase in anthropogenic emissions of reactive nitrogen from northeastern Asia and the subsequent enhanced deposition over the extensive regions of the North Pacific Ocean (NPO) have led to a detectable increase in the nitrate (N) concentration of the upper ocean. The rate of increase of excess N relative to phosphate (P) was found to be highest (∼0.24 micromoles per kilogram per year) in the vicinity of the Asian source continent, with rates decreasing eastward across the NPO, consistent with the magnitude and distribution of atmospheric nitrogen deposition. This anthropogenically driven increase in the N content of the upper NPO may enhance primary production in this N-limited region, potentially leading to a long-term change of the NPO from being N-limited to P-limited.

scholarly journals Biology and Economics of Recommendations for Insecticide-Based Management of Soybean Aphid

2016 ◽  
Vol 17 (4) ◽  
pp. 265-269 ◽  
Author(s):  
Robert L. Koch ◽  
Bruce D. Potter ◽  
Phillip A. Glogoza ◽  
Erin W. Hodgson ◽  
Christian H. Krupke ◽  
...  
Keyword(s):  
Insect Pest ◽  
Soybean Aphid ◽  
North Central ◽  
The North ◽  
Central United States ◽  
Glycine Max L ◽  
Short And Long Term ◽  
Aphis Glycines Matsumura

Soybean aphid, Aphis glycines Matsumura, remains the key insect pest of soybean, Glycine max (L.) Merrill, in the north-central United States. Management of this pest has relied primarily on scouting and application of foliar insecticides based on an economic threshold (ET) of 250 aphids per plant. This review explains why this ET remains valid for soybean aphid management, despite changes in crop value and input costs. In particular, we review how soybean aphid impacts soybean yield, the role of biology and economics in recommendations for soybean aphid management, and the short- and long-term consequences of inappropriately timed insecticide applications. Accepted for publication 13 December 2016.

scholarly journals Long‐term results of the treatment of patients with mantle cell lymphoma with cladribine (2‐CDA) alone (95‐80‐53) or 2‐CDA and rituximab (N0189) in the North Central Cancer Treatment Group

Cancer ◽  
2008 ◽  
Vol 113 (1) ◽  
pp. 108-116 ◽  
Author(s):  
David J. Inwards ◽  
Paul A. S. Fishkin ◽  
David W. Hillman ◽  
David W. Brown ◽  
Stephen M. Ansell ◽  
...  
Keyword(s):  
Treatment Group ◽  
Cancer Treatment ◽  
Mantle Cell Lymphoma ◽  
Cell Lymphoma ◽  
Long Term Results ◽  
North Central ◽  
The North ◽  
Mantle Cell

scholarly journals Trends in Twentieth-Century U.S. Snowfall Using a Quality-Controlled Dataset

2009 ◽  
Vol 26 (1) ◽  
pp. 33-44 ◽  
Author(s):  
Kenneth E. Kunkel ◽  
Michael Palecki ◽  
Leslie Ensor ◽  
Kenneth G. Hubbard ◽  
David Robinson ◽  
...  
Keyword(s):  
Atlantic Coast ◽  
Missouri River ◽  
Ohio Valley ◽  
North Central ◽  
Climate Research ◽  
The North ◽  
Lake Effect ◽  
Central United States

Abstract A quality assessment of daily manual snowfall data has been undertaken for all U.S. long-term stations and their suitability for climate research. The assessment utilized expert judgment on the quality of each station. Through this process, the authors have identified a set of stations believed to be suitable for analysis of trends. Since the 1920s, snowfall has been declining in the West and the mid-Atlantic coast. In some places during recent years the decline has been more precipitous, strongly trending downward along the southern margins of the seasonal snow region, the southern Missouri River basin, and parts of the Northeast. Snowfall has been increasing since the 1920s in the lee of the Rocky Mountains, the Great Lakes–northern Ohio Valley, and parts of the north-central United States. These areas that are in opposition to the overall pattern of declining snowfall seem to be associated with specific dynamical processes, such as upslope snow and lake-effect snow that may be responding to changes in atmospheric circulation.

scholarly journals Relationships between columnar aerosol optical properties and surface particulate matter observations in north-central Spain from long-term records (2003–2011)

2014 ◽  
Vol 7 (6) ◽  
pp. 5829-5882 ◽  
Author(s):  
Y. S. Bennouna ◽  
V. Cachorro ◽  
M. A. Burgos ◽  
C. Toledano ◽  
B. Torres ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Annual Cycle ◽  
Central Area ◽  
Central Spain ◽  
North Central ◽  
Desert Dust ◽  
The North ◽  
Daily Data ◽  
Dust Events

Abstract. This work examines the relationships between Aerosol Optical Depth (AOD) and Particulate Matter (PMX) parameters, based on long records (2003–2011) of two nearby sites from the AERONET and EMEP networks in the north-central area of Spain. The climatological annual cycle of PM10 and PM2.5 present a bimodality which might be partly due to desert dust intrusions, a pattern which does not appear in the annual cycle of the AOD. In the case of the AOD, this bimodality is likely to be masked because of the poor sampling of sunphotometer data as compared to PMX (67% of days against 90%), and this fact stresses the necessity of long-term observations. In monthly series, significant interannual variations are observed and most extrema coincide, however the bimodal shape remains relatively stable for PMX. Significant and consistent trends were found for both datasets likely associated to a decrease of desert dust apportionment until 2009. PM10 and AOD daily data are moderately correlated (0.56), a correlation improving for monthly means (0.70). In the case of strong desert dust events day-to-day correlation is not systematic, therefore an extensive analysis on PMX, fine-PM ratio, AOD and associated Ångström exponent (α) is carried out.

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