Ba da Kyakkyawan

Neopluvial wani lokaci ne na rigar da sanyi wanda ya faru a lokacin marigayi Holocene a Yammacin Amurka. A lokacin Neopluvial, matakan ruwa a cikin tabkuna da yawa da suka bushe yanzu da tabkuna da aka rufe kamar Great Salt Lake ya tashi kuma ciyayi sun canza don mayar da martani ga karuwar hazo. Wannan taron bai kasance daidai ba a ko'ina, tare da hauhawar matakin tafkin neopluvial da ke faruwa tsakanin shekaru 6,000 da 2,000 da suka gabata. Yana da alaƙa da lokacin Neoglacial.

 Tabbacin 
Neopluvial ya faru ne a yammacin Amurka a lokacin marigayi Holocene,  wanda ya haifar da matakan tabkuna a cikin Great Basin don ƙaruwa  kuma a baya tabkuna da maɓuɓɓugar ruwa sun cika. An lura da shi a cikin Great Salt Lake, Fallen Leaf Lake, Lake Cochise, da Mojave Desert, da Mono Lake, Owens Lake, Pyramid Lake, da San Luis Lake, da Silver Lake, da Summer Lake, da Tulare Lake, da Walker Lake da Winnemucca Lake.

A lokacin Neopluvial, Babban Tafkin Gishiri ya zama mai sanyi, kuma Tafkin Pyramid ya kai matakin ruwa na mita 1,186 (3,891  sama da matakin teku. Walker Lake, Owens Lake da Mono Lake sun sami mafi girman matakan ruwa na Holocene,  tare da yawan tabkuna biyu na ƙarshe fiye da ninki biyu.  Hakazalika, matakan ruwa a Tafkin Tahoe sun tashi har zuwa inda suka cika cikin Kogin Truckee. Tafkin Azurfa a cikin hamadar Mojave ya zama tafkin da ke ci gaba da kasancewa kuma ciyayi sun fi yaduwa a cikin Little Granite Mountains. Tafkin bazara ya tashi sama da matakin yau zuwa tsawo na  mita 1,278 (4,193 ,  kodayake ba shi da tsayi kamar yadda yake a tsakiyar Holocene.  Matsayin ruwa ya tashi a cikin Tafkin Tulare.

A cikin White Mountains, an kafa makiyaya a lokacin Neopluvial .  Yankunan kankara a cikin tsaunukan Beartooth  da kankara sun girma a cikin Sierra Nevada,  sagebrush steppe, shayi mai kore na Mormon da sauran ciyayi sun fadada a cikin yankin Great Salt Lake,  marshes sun fadada cikin tsakiya da arewacin Great Basin,  al'ummomin dabbobi masu shayarwa a cikin Tafkin Bonneville sun canza tare da dawowar linzamin aljihu mai tsayi mai tsayi, da linzamin girbi na Yamma zuwa wuraren da ba su kasance ba a baya ba kuma sun karu da yawa na bishiyoyi masu tsayi,  da aka rage zuwa cikin ƙananan itatuwa da ke shiga cikin bishiyoyi masu layin da aka saukowa, [3] Ba tare da fahimta ba, tsaunuka masu tsawo a yankin Lake Bonneville sun faru a lokacin Neopluvial, wanda zai iya nuna lokacin zafi. Ƙarshen neopluvial na iya daidaitawa tare da canjin yawan mutanen dace.

A cikin yankin Owens Valley, a lokacin Neopluvial yawan mutane ya zama mafi zama kuma kasuwancin Sierra Nevada ya zama ya kafa ("Newberry" / "Middle Archaic Period").  Yawan jama'a a kusa da Tafkin Alvord ya karu a wannan lokacin kuma ya kasance har ma bayan Neopluvial ya ƙare a can. A Nevada, an gina manyan gidaje na asali a lokacin neopluvial.

 Tarihin lokaci 
Farawar Neopluvial ya faru ne kimanin shekaru 6,000 kafin yanzu, amma bai faru a ko'ina a lokaci guda ba: 

 Neopluvial ya faru ne tsakanin shekaru 4,000 da 2,000 kafin yanzu a cikin Carson Sink. Neopluvial a cikin Tafkin Lahontan ya ƙare kimanin shekaru 2,000 da suka gabata.
 A cikin Fallen Leaf Lake, Neopluvial ya faru shekaru 3,700 kafin yanzu a cikin Fallen leaf Lake. Ƙarshen ya faru shekaru 3,650 kafin yanzu;  bayan wannan lokacin hazo ya zama mafi daidaituwa har zuwa farkon Little Ice Age kimanin shekaru 3,000 daga baya.
 An yi la'akari da shi tsakanin shekaru 5,100 da 2,650 kafin yanzu a tsakiyar arewacin Great Basin, 
 A cikin Babban Tafkin Gishiri, Neopluvial ya fara shekaru 5,000 kafin yanzu kuma matakan ruwa sun kai matsakaicin su tsakanin shekaru 3,000 da 2,000 kafin yanzu.
 Ya faru ne tsakanin shekaru 3,000 da 4,000 kafin yanzu a Lake Cochise . 
 Ya faru tsakanin shekaru 4,000 da 2,500 kafin yanzu a cikin Desert Mojave . 
 A cikin Tafkin Pyramid, Neopluvial ya fara ne daga shekaru 5,000 kafin yanzu kuma ya kai matsakaicin tsakanin shekaru 4,100 da 3,800 kafin yanzu a Tafkin Pyramide.
 Tafkuna masu tsawo a cikin Dutsen Rocky tare da ƙananan ruwa, musamman masu saurin canzawa ga ma'aunin ruwa, sun nuna karuwar lokaci guda a matakan tafkin daga shekaru 6,000 zuwa 5,000 kafin yanzu, wanda ke tsakiya a shekaru 5,700 da suka gabata.
 A cikin yankin Summer Lake, an rubuta Neopluvial a tsakanin shekaru 4,000 da 1,900 da suka gabata.
 Hawan matakan ruwa a Tafkin Tahoe ya nutsar da itatuwa tsakanin shekaru 4,800 da 5,700 kafin yanzu.
 A cikin Tafkin Tulare, Neopluvial ya kasance tsakanin shekaru 4,500 da 2,800 kafin yanzu; bayan haka mummunan fari ya faru.

 Abubuwan da suka shafi 
Neopluvial yana da alaƙa da Neoglacial, kuma mai yiwuwa canji ne a yanayin hunturu a Arewacin Pacific. Wannan sanyaya an bayyana shi da farko ta hanyar raguwar insolation na rani, kodayake alamu masu daidaitawa a cikin martani na hydrological a ma'auni na sub-millennial na iya danganta da sauye-sauyen zagayawar yanayi wanda abubuwan kamar bambancin ciki a cikin haɗin kai na teku. Karfafa bambancin ENSO, sanyaya Arewacin Pacific da kuma sauyawa zuwa kudu na rafin jet na Pacific sun dace da Neopluvial. Neopluvial yayi kama da lokacin Pluvial wanda ya faru a yammacin Arewacin Amurka a lokacin marigayi Last Glacial Maximum, amma ya kasance mai rauni fiye da lokacin LGM

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