广东深圳蒲君

first_imgAs the planet cooled from peak warmth in the early Cenozoic, extensive Northern Hemisphere ice sheets developed by 2.6 Ma ago, leading to changes in the circulation of both the atmosphere and oceans. From not, vert, similar2.6 to not, vert, similar1.0 Ma ago, ice sheets came and went about every 41 ka, in pace with cycles in the tilt of Earth’s axis, but for the past 700 ka, glacial cycles have been longer, lasting not, vert, similar100 ka, separated by brief, warm interglaciations, when sea level and ice volumes were close to present. The cause of the shift from 41 ka to 100 ka glacial cycles is still debated. During the penultimate interglaciation, not, vert, similar130 to not, vert, similar120 ka ago, solar energy in summer in the Arctic was greater than at any time subsequently. As a consequence, Arctic summers were not, vert, similar5 °C warmer than at present, and almost all glaciers melted completely except for the Greenland Ice Sheet, and even it was reduced in size substantially from its present extent. With the loss of land ice, sea level was about 5 m higher than present, with the extra melt coming from both Greenland and Antarctica as well as small glaciers. The Last Glacial Maximum (LGM) peaked not, vert, similar21 ka ago, when mean annual temperatures over parts of the Arctic were as much as 20 °C lower than at present. Ice recession was well underway 16 ka ago, and most of the Northern Hemisphere ice sheets had melted by 6 ka ago. Solar energy reached a summer maximum (9% higher than at present) not, vert, similar11 ka ago and has been decreasing since then, primarily in response to the precession of the equinoxes. The extra energy elevated early Holocene summer temperatures throughout the Arctic 1–3 °C above 20th century averages, enough to completely melt many small glaciers throughout the Arctic, although the Greenland Ice Sheet was only slightly smaller than at present. Early Holocene summer sea ice limits were substantially smaller than their 20th century average, and the flow of Atlantic water into the Arctic Ocean was substantially greater. As summer solar energy decreased in the second half of the Holocene, glaciers re-established or advanced, sea ice expanded, and the flow of warm Atlantic water into the Arctic Ocean diminished. Late Holocene cooling reached its nadir during the Little Ice Age (about 1250–1850 AD), when sun-blocking volcanic eruptions and perhaps other causes added to the orbital cooling, allowing most Arctic glaciers to reach their maximum Holocene extent. During the warming of the past century, glaciers have receded throughout the Arctic, terrestrial ecosystems have advanced northward, and perennial Arctic Ocean sea ice has diminished. Here we review the proxies that allow reconstruction of Quaternary climates and the feedbacks that amplify climate change across the Arctic. We provide an overview of the evolution of climate from the hot-house of the early Cenozoic through its transition to the ice-house of the Quaternary, with special emphasis on the anomalous warmth of the middle Pliocene, early Quaternary warm times, the Mid Pleistocene transition, warm interglaciations of marine isotope stages 11, 5e, and 1, the stage 3 interstadial, and the peak cold of the last glacial maximum.last_img read more

first_imgBasketball is more than a sport. It unifies individuals in ways that are inexplicable. This camaraderie between players, coaches, parents, and campers was on full display Saturday, November 23 at Batesville High School. The Batesville High School Boys Basketball program hosted its 6th annual Garrett’s Gang Camp for individuals with special needs this past weekend.The Garrett’s Gang camp consists of a series of basketball-related activities that the campers participate in under the guidance of the players of the Batesville Boys Basketball team. These activities include the stations of free throws, passing, layups, dunking, shooting, and dribbling. Following the stations, the campers participated in a half-court basketball game. Next, they competed in a highly competitive dribbling relay race that brings out the excitement and joy from everyone in attendance. To conclude the camp, the parents, coaches, and players, take the time to acknowledge the exceptional achievements and accolades of the campers in attendance.The feedback given by the campers is always wonderful. When asked what makes this camp so memorable every year a camper, Nick Jacobs, replied,” I like to come back every year because I like it when I get to play basketball and be around the players.” Another camper, Kendra Franklin, was asked what her favorite part about the camp was and she answered, “My favorite part is getting to meet all the players, the campers, and just being around everyone brings a smile to my face.” RJ Powell’s, a Batesville Basketball player, replied, ”Not only does this put a smile on the campers’ faces, but it also puts a smile on our face.” RJ speaks for us all in that aspect as the joy and pure happiness emitted by everyone is tenfold of what it traditionally is.Head Coach, Aaron Garett, asserted, “This is my favorite day of the year. We get to focus on kids that don’t have disabilities but have special abilities. It’s a great day in terms of our players working with them, giving part of themselves to these kids to make it a great day for them, and on the flip side, these campers get to show us their special abilities. The authenticity, pure joy, passion, and fun is on full display.” Being in the presence of these individuals is truly a once in a lifetime experience that is unparalleled. They bring unique and remarkable memories to us players and coaches.  The impact these individuals will continue to have on everyone is truly unprecedented.The basketball program would like to thank the campers, parents, coaches, and players that make this extraordinary day possible. Thank you to the sponsors, Batesville Chrysler and The Garrett Group, who allow the camp to be free of charge. And an additional thank you to the sponsors, McDonald’s, Batesville Tool & Die, Jama Cleghorn, the Linkel family, and First Financial- Chad Mehlon, who provided the parting gifts. We would also like to encourage everyone to come out to the Batesville versus North Decatur basketball game on January 31 to honor the campers as they will be given an introduction prior to tip-off of the varsity game.  By Lleyton RatcliffeJunior, Batesville High Schoollast_img read more