scholarly journals The Application of Diabatic Heating inQ-Vectors for the Study of a North American Cyclone Event

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Katie L. Crandall ◽  
Patrick S. Market ◽  
Anthony R. Lupo ◽  
Laurel P. McCoy ◽  
Rachel J. Tillott ◽  
...  
Keyword(s):  
United States ◽  
Life Cycle ◽  
North American ◽  
Diabatic Heating ◽  
Latent Heating ◽  
Extended Version ◽  
Vector Form ◽  
Central United States

An extended version of theQ-vector form for theω-equation that includes diabatic (in particular latent) heating in theQ-vector itself is derived and tested for use in analyzing the life-cycle of a midlatitude cyclone that developed over the central United States during 24–26 December 2009. While the inclusion of diabatic heating in theQ-vectorω-equation is not unique to this work, the inclusion of diabatic heating in theQ-vector itself is a unique formulation. Here it is shown that the diabaticQ-vector gives a better representation of the forcing contributing to the life-cycle of the Christmas Storm of 2009 using analyses derived from the 80-km NAM.

A new North American chorus frog species (Amphibia: Hylidae: Pseudacris) from the south-central United States

Zootaxa ◽  
2008 ◽  
Vol 1675 (1) ◽  
pp. 1 ◽  
Author(s):  
EMILY MORIARTY LEMMON ◽  
ALAN R. LEMMON ◽  
JOSEPH T. COLLINS ◽  
DAVID C. CANNATELLA
Keyword(s):  
United States ◽  
New Species ◽  
North American ◽  
Advertisement Call ◽  
The South ◽  
The North ◽  
South Central ◽  
Central United States ◽  
Chorus Frog ◽  
Genetic Characters

We describe a new species of chorus frog of the North American treefrog genus Pseudacris from the south-central United States. This new species is morphologically similar to the parapatric species P. feriarum and has thus previously been considered synonymous with this species. The new species is geographically distinct from P. feriarum and from its sister species, P. nigrita. We diagnose the new species based on advertisement call, morphological, and genetic characters.

scholarly journals Variation of the North American Summer Monsoon Regimes and the Atlantic Multidecadal Oscillation

2008 ◽  
Vol 21 (11) ◽  
pp. 2371-2383 ◽  
Author(s):  
Qi Hu ◽  
Song Feng
Keyword(s):  
United States ◽  
North American ◽  
Summer Rainfall ◽  
Atlantic Multidecadal Oscillation ◽  
North American Monsoon ◽  
Western North America ◽  
The North ◽  
West Mexico ◽  
Central United States ◽  
Rainfall Variations

Abstract The North American summer monsoon holds the key to understanding warm season rainfall variations in the region from northern Mexico to the Southwest and the central United States. Studies of the monsoon have pictured mosaic submonsoonal regions and different processes influencing monsoon variations. Among the influencing processes is the “land memory,” showing primarily the influence of the antecedent winter season precipitation (snow) anomalies in the Northwest on summer rainfall anomalies in the Southwest. More intriguingly, the land memory has been found to vary at the multidecadal time scale. This memory change may actually reflect multidecadal variations of the atmospheric circulation in the North American monsoon region. This notion is examined in this study by first establishing the North American monsoon regimes from relationships of summer rainfall variations in central and western North America, and then quantifying their variations at the multidecadal scale in the twentieth century. Results of these analyses show two monsoon regimes: one featured with consistent variations in summer rainfall in west Mexico and the Southwest and an opposite variation pattern in the central United States, and the other with consistent rainfall variations in west Mexico and the central United States but different from the variations in the southwest United States. These regimes have alternated at multidecadal scales in the twentieth century. This alternation of the regimes is found to be in phase with the North Atlantic Multidecadal Oscillation (AMO). In warm and cold phases of the AMO, distinctive circulation anomalies are found in central and western North America, where lower than average pressure prevailed in the warm phase and the opposite anomaly in the cold phase. Associated wind anomalies configured different patterns for moisture transport and may have contributed to the development and variation of the monsoon regimes. These results indicate that investigations of the effects of AMO and its interaction with the North Pacific circulations could lead to a better understanding of the North American monsoon variations.

IPCC’s Twentieth-Century Climate Simulations: Varied Representations of North American Hydroclimate Variability

2006 ◽  
Vol 19 (16) ◽  
pp. 4041-4058 ◽  
Author(s):  
Alfredo Ruiz-Barradas ◽  
Sumant Nigam
Keyword(s):  
United States ◽  
Twentieth Century ◽  
North American ◽  
Warm Season ◽  
Precipitation Variability ◽  
Model Version ◽  
Central United States ◽  
Hydroclimate Variability ◽  
Moisture Fluxes ◽  
The U.S

Abstract The annual cycle of precipitation and the interannual variability of the North American hydroclimate during summer months are analyzed in coupled simulations of the twentieth-century climate. The state-of-the-art general circulation models, participating in the Fourth Assessment Report for the Intergovernmental Panel on Climate Change (IPCC), included in the present study are the U.S. Community Climate System Model version 3 (CCSM3), the Parallel Climate Model (PCM), the Goddard Institute for Space Studies model version EH (GISS-EH), and the Geophysical Fluid Dynamics Laboratory Coupled Model version 2.1 (GFDL-CM2.1); the Met Office’s Third Hadley Centre Coupled Ocean–Atmosphere GCM (UKMO-HadCM3); and the Japanese Model for Interdisciplinary Research on Climate version 3.2 [MIROC3.2(hires)]. Datasets with proven high quality such as NCEP’s North American Regional Reanalysis (NARR), and the Climate Prediction Center (CPC) U.S.–Mexico precipitation analysis are used as targets for simulations. Climatological precipitation is not easily simulated. While models capture winter precipitation very well over the U.S. northwest, they encounter failure over the U.S. southeast in the same season. Summer precipitation over the central United States and Mexico is also a great challenge for models, particularly the timing. In general the UKMO-HadCM3 is closest to the observations. The models’ potential in simulating interannual hydroclimate variability over North America during the warm season is varied and limited to the central United States. Models like PCM, and in particular UKMO-HadCM3, exhibit reasonably well the observed distribution and relative importance of remote and local contributions to precipitation variability over the region (i.e., convergence of remote moisture fluxes dominate over local evapotranspiration). However, in models like CCSM3 and GFDL-CM2.1 local contributions dominate over remote ones, in contrast with warm-season observations. In the other extreme are models like GISS-EH and MIROC3.2(hires) that prioritize the remote influence of moisture fluxes and neglect the local influence of land surface processes to the regional precipitation variability.

Morphological notes on Gazoryctra sciophanes (Ferguson) and G. confusus (Edwards) (Lepidoptera: Hepialoidea: Hepialidae)

Zootaxa ◽  
2020 ◽  
Vol 4896 (4) ◽  
pp. 586-590
Author(s):  
JOHN R. GREHAN ◽  
CARLOS G.C. MIELKE
Keyword(s):  
United States ◽  
North American ◽  
Rocky Mountains ◽  
Southern Appalachians ◽  
Northern Eurasia ◽  
Suitable Habitat ◽  
Southern Rocky Mountains ◽  
The North ◽  
Central United States ◽  
Southern Central

The genus Gazoryctra Hübner comprises 10 species in North America and four in northern Eurasia. The remaining diversity of North American Hepialidae is represented by four species of Sthenopis Packard, three species of Phymatopus Wallengren, and one species of Korscheltellus Börner (Nielsen et al. 2000; Grehan & Knyazev 2019). The North American distribution of Gazoryctra extends between Alaska and southern Appalachians and southern Rocky Mountains (Grehan & Mielke 2018). As with other North American Hepialidae, Gazoryctra is absent from much of the southern-central United States where there is ostensibly suitable habitat present as this genus is found in forested regions where it is believed to feed on roots or other organic matter (Schweitzer et al. 2011). This absence may be due to the lack of colonization following regression of inland seas that covered much of this region until the end of the Mesozoic (Grehan & Mielke 2018). 

scholarly journals The Diptera, or True Flies, of Illinois

1983 ◽  
Vol 33 (1-4) ◽  
pp. 1-122 ◽  
Author(s):  
L. L. Pechuman ◽  
Donald W. Webb ◽  
H. J. Teskey
Keyword(s):  
United States ◽  
North American ◽  
Present Knowledge ◽  
North American Species ◽  
Dairy Farmers ◽  
The North ◽  
Taxonomic Descriptions ◽  
Central United States ◽  
Horse Flies

The tabanids, or horse flies and deer flies, are well known to dairy farmers and livestock producers as well as to campers, fishermen, and outdoor enthusiasts as annoying and pain-inflicting inhabitants of most wooded areas of Illinois. These large and persistent flies impart a painful bite and can occur in large enough numbers to make canoeing and hiking virtually impossible. The tabanid fauna of Illinois has never been studied, although several of the surrounding states have published various reports: Indiana (Burton 1975; Meyer & Sanders 1975), Wisconsin (Roberts & Dicke 1958), Iowa (Richards &: Knight 1967), Missouri (Andrews & Wingo 1975), Tennessee (Goodwin 1966), Michigan (Hays 1956), Ohio (Hine 1903), Minnesota (Philip 1931), and Arkansas (Schwardt 1936; Schwardt & Hall 1930). This study is intended to make available in brief form our present knowledge of the tabanids in the central United States, with keys for their determination, and the distribution of those species occurring in Illinois. No attempt is made to give detailed taxonomic descriptions of species. If needed, these can be found for most species in the papers of Brennan (1935) and Stone (1938). Philip (1954, 1955) has keys to all the North American Pangoniinae and Chrysopsinae known at that time. The most recent list of the North American species of Tabanidae is given by Philip (1965).

scholarly journals Ordovician-Silurian mass extinction and recovery: coral faunas in the east-central United States

1992 ◽  
Vol 6 ◽  
pp. 92-92
Author(s):  
Robert J. Elias ◽  
Graham A. Young
Keyword(s):  
United States ◽  
Continental Margin ◽  
North American ◽  
Mass Extinction ◽  
Rapid Evolution ◽  
Striking Difference ◽  
Suitable Habitat ◽  
East Central ◽  
Geographic Ranges ◽  
Central United States

Three successive coral faunas that are involved in the Ordovician-Silurian mass extinction and recovery occur in latest Ordovician (Richmondian-Gamachian) to earliest Silurian (early Llandovery; Rhuddanian) strata of the east-central United States. The Richmondian fauna comprises typical cratonic North American Late Ordovician corals. In the Cincinnati Arch region, these belong to the Richmond Province and include massive stauriids (e.g., Favistina), sarcinulids (e.g., Foerstephyllum, Calapoecia), and common tetradiids. In the upper Mississippi Valley region, corals belong to the Red River-Stony Mountain Province and include the streptelasmatid Salvadorea. The disappearance of typical Ordovician-type coral faunas from the interior of eastern North America was related to habitat loss resulting from progradation of the Queenston delta and regression of the epeiric sea during a major glacio-eustatic drop in the late Richmondian.The succeeding fauna of Gamachian to early Rhuddanian age represents the Edgewood Province. The solitary rugosan Streptelasma is dominant; colonial rugosans are rare and are all fasciculate. The principal tabulates are Paleofavosites, Propora, and Halysites; sarcinulids are absent. Rare tetradiids (Rhabdotetradium) are among the youngest representatives worldwide of an important Ordovician order. The Edgewood fauna includes first occurrences of typical Silurian taxa: the earliest North American halysitine (Halysites), the oldest definite plasmoporid (Plasmopora), and the earliest known pycnostylid (Pycnostylus). The striking difference between Richmondian and Edgewood faunas in the east-central United States reflects, at least in part, a hiatus between Richmondian and Gamachian deposition. Corals were introduced to the Edgewood Province from the continental margin, or were derived from forms previously restricted to the continental margin. This occurred during minor transgressions from the south, as sea level fluctuated during a regressive phase corresponding to the Gamachian glacial maximum. Immigration was evidently related to shifts of suitable habitat areas during a time of depressed temperatures. Edgewood corals dispersed farther northward during the early phase of the major latest Gamachian to Early Llandovery transgression associated with deglaciation.Corals are uncommon in late Rhuddanian strata immediately above those containing the Edgewood fauna. This Silurian fauna includes the solitary rugosans Rhegmaphyllum, Dinophyllum, Dalmanophyllum, and Cyathactis?, which were not derived from Edgewood taxa. Colonial rugosans are absent. The tabulates belong to Paleofavosites, Propora, and Halysites, the dominant colonial genera in the Edgewood fauna. At least some of the species were likely derived from Edgewood forms; others may have been introduced from elsewhere, or perhaps were derived from species in other areas. A slight stratigraphic overlap of several Edgewood and Silurian species is known at one locality, but the faunal change is otherwise abrupt. The changeover from Edgewood to Silurian faunas took place as water depth and temperature were generally increasing during the Rhuddanian. However, corals of the Silurian fauna appear above intraformational channels in one area and above unconformities or formational boundaries elsewhere, suggesting that the change occurred during an intervening regressive event. It is inferred that as areas in the east-central United States became inhospitable, geographic ranges of Edgewood corals were reduced. Most species became extinct; some colonial corals apparently underwent rapid evolution, probably in small populations. The descendants dispersed and new immigrants arrived as suitable habitat areas expanded when the Early Llandovery transgression resumed. A few Edgewood colonial species survived for a short time, evidently in local refugia. Unlike the colonial corals, all solitary forms known from the Silurian assemblage were immigrants. Corals of the Silurian assemblage probably favored somewhat deeper water than those of the Edgewood Assemblage.

Scaling northeastern United States/southeastern Canadian earthquakes by their Lg waves

1976 ◽  
Vol 66 (5) ◽  
pp. 1525-1537 ◽  
Author(s):  
Ronald L. Street
Keyword(s):  
United States ◽  
Spectral Analysis ◽  
North America ◽  
North American ◽  
Magnitude Scale ◽  
Northeastern United States ◽  
Northeastern North America ◽  
Central United States ◽  
Lg Wave ◽  
Spatial Attenuation

abstract Displacement spectral densities and spatial attenuation of Lg waves from four earthquakes were studied in detail to determine the applicability of Nuttli's (1973) Lg-magnitude formulas to northeastern North American earthquakes. It was found that the 1-sec-period Lg wave from these events was attenuated at a slightly greater rate than has been observed in the central United States. However, comparison of the A/T observations and the Lg spectral analysis results of the two regions demonstrated that it was permissible to use Nuttli's Lg-magnitude formulas for scaling northeastern earthquakes if the amplitude observations are restricted to within 20° of the earthquake's epicenter. This result establishes the basis for a unified mb magnitude scale between central and northeastern North America.

Benjamin Henry Latrobe and the nomenclature of two North American fishes

1987 ◽  
Vol 14 (1) ◽  
pp. 85-88
Author(s):  
CHARLOTTE M PORTER
Keyword(s):  
United States ◽  
North American ◽  
The United States ◽  
American Shad ◽  
New Name ◽  
The Common ◽  
Fish Louse

A curious error affects the names of three North American clupeids—the Alewife, American Shad, and Menhaden. The Alewife was first described by the British-born American architect, Benjamin Henry Latrobe in 1799, just two years after what is generally acknowledged as the earliest description of any ichthyological species published in the United States. Latrobe also described the ‘fish louse’, the common isopod parasite of the Alewife, with the new name, Oniscus praegustator. Expressing an enthusiasm for American independence typical of his generation, Latrobe humorously proposed the name Clupea tyrannus for the Alewife because the fish, like all tyrants, had parasites or hangers-on.

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