scholarly journals Anthropogenic and natural effects on the coastal lagoons in the southwest of Spain (Doñana National Park)

2009 ◽  
Vol 66 (7) ◽  
pp. 1508-1514 ◽  
Author(s):  
Arturo Sousa ◽  
Pablo García-Murillo ◽  
Julia Morales ◽  
Leoncio García-Barrón
Keyword(s):  
Global Warming ◽  
Little Ice Age ◽  
National Park ◽  
Coastal Lagoons ◽  
Underground Water ◽  
Ice Age ◽  
Doñana National Park ◽  
Anthropogenic Effect ◽  
Marine Sand ◽  
Mobile Dune

Abstract Sousa, A., García-Murillo, P., Morales, J., and García-Barrón, L. 2009. Anthropogenic and natural effects on the coastal lagoons in the southwest of Spain (Doñana National Park). – ICES Journal of Marine Science, 66: 1508–1514. The Doñana peridunal lagoons, located in the southwest of Spain, have been well studied, because their conservation is of great interest. Since 1965, they have also been affected by the extraction of underground water for local coastal tourist resorts. A reconstruction of the evolution of this series of coastal lagoons reveals that, along with the anthropogenic effect, there was a natural effect resulting from the reactivation of mobile dune fronts that have blocked and filled the original lagoon complex—in the period 1920–1987, the lagoons were reduced by 70.7%. These fronts might have been fed by deposits of marine sand during the climatically driest phases of the Little Ice Age in Andalusia, Spain. Therefore, if the frequency and duration of dry periods increase, as well as droughts as a whole, because of global warming, the desiccation and disappearance of the lagoons could become more widespread, not only at this site in southwestern Europe, but in other Mediterranean coastal ecosystems as well.

IMPENDING LOSS OF LITTLE ICE AGE GLACIERS IN YOSEMITE NATIONAL PARK

2017 ◽  
Author(s):  
Greg M. Stock ◽  
◽  
Robert S. Anderson ◽  
Thomas H. Painter ◽  
Brian Henn ◽  
...  
Keyword(s):  
Little Ice Age ◽  
National Park ◽  
Ice Age ◽  
Yosemite National Park

scholarly journals Prehistoric Irrigation in Central Utah: Chronology, Agricultural Economics, and Implications

2020 ◽  
Vol 85 (3) ◽  
pp. 452-469 ◽  
Author(s):  
Steven R. Simms ◽  
Tammy M. Rittenour ◽  
Chimalis Kuehn ◽  
Molly Boeka Cannon
Keyword(s):  
Little Ice Age ◽  
National Park ◽  
Colorado River ◽  
Agricultural Economics ◽  
Ice Age ◽  
National Forest ◽  
Irrigation Canal ◽  
Maintenance Costs ◽  
Cultural Affiliation ◽  
Original Construction

In 1928, Noel Morss was shown “irrigation ditches” along Pleasant Creek on the Dixie National Forest near Capitol Reef National Park, Utah, by a local guide who contended they were ancient. We relocated the site and mapped the route of an unusual mountain irrigation canal. We conducted excavations and employed OSL and AMS 14C showing historic irrigation, and an earlier event between AD 1460 and 1636. Geomorphic evidence indicates that the canal existed prior to this time, but we cannot date its original construction. The canal is 7.2 km long, originating at 2,450 m asl and terminating at 2,170 m asl. Less than half of the system was hand constructed. We cannot ascribe the prehistoric use-event to an archaeological culture, language, or ethnic group, but the 100+ sites nearby are largely Fremont in cultural affiliation. We also report the results of experimental modeling of the capital and maintenance costs of the system, which holds implications for irrigation north of the Colorado River and farming during the Little Ice Age. The age of the prehistoric canal is consistent with a fragmentary abandonment of farming and continuity between ancient and modern tribes in Utah.

The Little Ice Age: The Prelude to Global Warming, 1300-1850

2001 ◽  
Vol 80 (5) ◽  
pp. 160
Author(s):  
Richard N. Cooper ◽  
Brian Fagan
Keyword(s):  
Global Warming ◽  
Little Ice Age ◽  
Ice Age

scholarly journals Recent Debris-Flow and Flash-Flood History of Northeastern Yellowstone National Park

1996 ◽  
Vol 20 ◽  
pp. 3-11
Author(s):  
Joshua Landis ◽  
Grant Meyer
Keyword(s):  
Debris Flow ◽  
Yellowstone National Park ◽  
Little Ice Age ◽  
National Park ◽  
Flash Flood ◽  
Global Climate ◽  
Ice Age ◽  
Drought Severity ◽  
History Of ◽  
Flow Activity

An understanding of the ecological health of stream systems and riparian areas in Yellowstone National Park (YNP) requires knowledge of their response to climatic and hydrological influences; intrinsic factors such as relief and geological materials are important influences as well (e.g., O'Hara and Meyer 1995). Recent studies of southwestern (Ely et al. 1993) and midwestern U.S. rivers (Knox 1993) have shown that relatively minor climatic changes in the late Holocene are associated with large fluctuations in flood magnitude and frequency. In small, steep drainage basins of northeastern YNP (Figure 1), Meyer et al. (1992, 1995) associated increased fire-related debris-flow activity with decadal to millennial-scale cycles of drought over the Holocene. Observations of modern events indicate that debris-flow and flash floods are also produced in the absence of fire in this rugged mountainous region, primarily by intense summer thunderstorm precipitation. Although a correlation between drought severity and fire magnitude in Yellowstone is clear (Balling et al. 1992a, 1992b), the relationship hypothesized by Meyer et al. (1992,1995) between warm, drought-prone climatic episodes and debris-flow activity in this region requires further investigation. Therefore, we use relatively high-resolution lichenometric and tree­ring dating methods to construct a 250-year history of major hydrologic events in small, steep tributary basins of Soda Butte Creek in northeastern Yellowstone. This period spans the transition from the generally cooler global climate of the Little Ice Age to the present (e.g., Grove 1988). Although the Little Ice Age was not uniformly cold in either a spatial or temporal sense (Jones and Bradley 1995), and YNP climate is not well known in the earlier part of this interval, trends toward increasing summer temperatures and decreasing winter precipitation in YNP over the last ~100 yr are consistent with this transition (Balling et al. 1992a).

Ozone-aerosol and land use reversed temperature increase over some northern mid-latitude regions between the 20th century and the Little Ice Age based on the CESM-LME

The Holocene ◽  
2021 ◽  
pp. 095968362110417
Author(s):  
Jiapeng Miao ◽  
Tao Wang ◽  
Dabang Jiang
Keyword(s):  
Land Use ◽  
Global Warming ◽  
20Th Century ◽  
Little Ice Age ◽  
Dominant Role ◽  
Ice Age ◽  
Last Millennium ◽  
Local Climate ◽  
Aerosol Forcing ◽  
Cooling Effects

Global warming is a widely concerned topic, and the surface temperature has shown an accelerated warming trend during the past several decades. From the perspective of a longer time scale, the 20th century (1900–2000) could be the warmest period in the last millennium, and the global or hemispheric averaged temperature over this period is higher than that over other centuries, particularly compared with that over the Little Ice Age (LIA; 1450–1850). However, we recently found that, in the reconstruction, the 20th-century temperature over some northern mid-latitude regions could be significantly lower than that during the LIA, which contradicts our previous perceptions regarding global warming. Modeling results from the Last Millennium Ensemble Project also reproduce a similar phenomenon, that is, the 20th-century cooling over some northern mid-latitude regions (CNMR). The simulated CNMR can be found in all four seasons. Further analysis indicates that the cooling effects from ozone-aerosol and land use forcings, overcoming greenhouse gas and solar forcing induced warming, play dominant roles in causing the CNMR. The ozone-aerosol forcing reduces the surface net shortwave flux through both direct aerosol–radiation interaction and atmosphere–cloud feedback, while the land use forcing causes negative net shortwave flux anomalies through modulation of surface albedo. Overall, the ozone-aerosol and land use forcings shape the CNMR phenomenon by inducing anomalous surface net shortwave flux, with the ozone-aerosol forcing playing a dominant role. This study highlights the important influences of ozone-aerosol and land use cooling effects on local climate.

scholarly journals New Little ICE Age Instead of Global Warming?

2003 ◽  
Vol 14 (2-3) ◽  
pp. 327-350 ◽  
Author(s):  
Theodor Landscheidt
Keyword(s):  
Global Warming ◽  
Solar Activity ◽  
Little Ice Age ◽  
Orbital Motion ◽  
Maunder Minimum ◽  
Ice Age ◽  
Centre Of Mass ◽  
Long Period ◽  
The Last Two Millennia ◽  
Cool Climate

Analysis of the sun's varying activity in the last two millennia indicates that contrary to the IPCC's speculation about man-made global warming as high as 5.8°C within the next hundred years, a long period of cool climate with its coldest phase around 2030 is to be expected. It is shown that minima in the secular Gleissberg cycle of solar activity, coinciding with periods of cool climate on Earth, are consistently linked to an 83-year cycle in the change of the rotary force driving the sun's oscillatory motion about the centre of mass of the solar system. As the future course of this cycle and its amplitudes can be computed, it can be seen that the Gleissberg minimum around 2030 and another one around 2200 will be of the Maunder minimum type accompanied by severe cooling on Earth. This forecast should prove ‘skilful’ as other long-range forecasts of climate phenomena, based on cycles in the sun's orbital motion, have turned out correct, as for instance the prediction of the last three El Niños years before the respective event.

scholarly journals Antarctic Winds: Pacemaker of Global Warming, Global Cooling, and the Collapse of Civilizations

Climate ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 130
Author(s):  
W. Davis ◽  
W. Davis
Keyword(s):  
Global Warming ◽  
Little Ice Age ◽  
Ice Cores ◽  
Ice Age ◽  
Temperature Cycle ◽  
Wind Pattern ◽  
The Past ◽  
Global Cooling ◽  
Wind Cycle ◽  
The Antarctic

We report a natural wind cycle, the Antarctic Centennial Wind Oscillation (ACWO), whose properties explain milestones of climate and human civilization, including contemporary global warming. We explored the wind/temperature relationship in Antarctica over the past 226 millennia using dust flux in ice cores from the European Project for Ice Coring in Antarctica (EPICA) Dome C (EDC) drill site as a wind proxy and stable isotopes of hydrogen and oxygen in ice cores from EDC and ten additional Antarctic drill sites as temperature proxies. The ACWO wind cycle is coupled 1:1 with the temperature cycle of the Antarctic Centennial Oscillation (ACO), the paleoclimate precursor of the contemporary Antarctic Oscillation (AAO), at all eleven drill sites over all time periods evaluated. Such tight coupling suggests that ACWO wind cycles force ACO/AAO temperature cycles. The ACWO is modulated in phase with the millennial-scale Antarctic Isotope Maximum (AIM) temperature cycle. Each AIM cycle encompasses several ACWOs that increase in frequency and amplitude to a Wind Terminus, the last and largest ACWO of every AIM cycle. This historic wind pattern, and the heat and gas exchange it forces with the Southern Ocean (SO), explains climate milestones including the Medieval Warm Period and the Little Ice Age. Contemporary global warming is explained by venting of heat and carbon dioxide from the SO forced by the maximal winds of the current positive phase of the ACO/AAO cycle. The largest 20 human civilizations of the past four millennia collapsed during or near the Little Ice Age or its earlier recurrent homologs. The Eddy Cycle of sunspot activity oscillates in phase with the AIM temperature cycle and therefore may force the internal climate cycles documented here. Climate forecasts based on the historic ACWO wind pattern project imminent global cooling and in ~4 centuries a recurrent homolog of the Little Ice Age. Our study provides a theoretically-unified explanation of contemporary global warming and other climate milestones based on natural climate cycles driven by the Sun, confirms a dominant role for climate in shaping human history, invites reconsideration of climate policy, and offers a method to project future climate.

Sign in / Sign up

Export Citation Format

Share Document