Hoʻomehana Honua: ʻO kahi kekelē o ka desiccation ʻaʻole i ʻike ʻia i 200 mau makahiki i nā loko iʻa sub-arctic

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Nā ʻĀina Lapaʻau ʻo Kanada

Ka hoʻemi ʻana o ka ua i ke ʻano o ka hau i ʻike ʻia i nā makahiki i hala iho nei i ka sub zctic zones Ua alakaʻi ʻo Kanada i kahi maloʻo hopohopo o ka Lake District.

ʻO kēia ka hopena i hoʻoholo ʻia e kekahi mau mea noiʻi mai ke Kulanui ʻo Laval, ke Kulanui ʻo Wilfrid Laurier, ke Kulanui ʻo Brock a me ke Kulanui o Waterloo i kahi noiʻi i paʻi ʻia i kekahi mau pule i hala aku nei ma ka ʻaoʻao kūhelu o ka puke pai ʻepekema Geophysical Research Letters. Ke hōʻike nei i kahi hōʻoia hou aʻe, inā ʻaʻole lawa lākou i ka maopopo o ka hoʻomehana honua.

Ua hoʻoholo kēia mau mea noiʻi ma hope o ke aʻo ʻana i nā loko he 70 ma kahi o Old Crow, Yukon a me Churchill, Manitoba, Kanada. ʻO ka hapa nui o nā loko i aʻo ʻia ma lalo o hoʻokahi mika ka hohonu. Wahi a nā kālailai i hana ʻia, ʻoi aku ma mua o ka hapalua o nā loko i kū i nā wahi pālahalaha a hoʻopuni ʻia e nā kumu, hōʻike i nā hōʻailona o ka desiccation.

ʻO kēia pilikia ma muli o ka emi o ka wai e hele mai ana mai ka dilaweli. ʻO kahi laʻana, mai 2010 a 2012, ua heleleʻi ka ua hoʻoilo i Churchil ma 76 mm i ka hoʻohālikelike ʻana i nā averika i hoʻopaʻa ʻia ma waena o 1971 a me 2000. ʻO ka hoʻomaloʻo ʻana i kekahi mau loko, i ʻike maka ʻia e ka maka maka ʻole no ka manawa mua ma 2010, ʻoi aku ka nui. i haʻi ʻia ma 2013.

No kēia ʻano loko, ʻo ka heleleʻi i ke ʻano o ka hau e hōʻike ana ma waena o 30% a 50% o ka hāʻawi wai i kēlā me kēia makahiki. ʻO ke ʻano o ka hoʻomaloʻo ʻana i ʻike ʻia e nā mea noiʻi ʻaʻole ia i hana mua ʻia i nā makahiki he 200 i hala. Eia kekahi, ua mālama ʻia nā hōʻike isotopic i mālama ʻia i ka phytoplankton i loko o nā moena o ka loko e hōʻike ana ua mālama nā loko i ke kaulike wai wai no 200 mau makahiki.

Ua hoʻopau koke ʻia kēia kūpaʻa i kekahi mau makahiki i hala. Inā hoʻomau ke ʻano o ke kau maloʻo a me ka hoʻoilo me ka liʻiliʻi o ka hau, e like me ka wānana ʻia e ke ʻano o ke aniau, ʻo ka hapa nui o nā loko ʻomaʻomaʻu papapae hiki ke maloʻo loa. He paʻakikī e wānana i nā hopena āpau o ka nalo ʻana o kēia wahi noho, akā he ʻoiaʻiʻo he mea nui nā hopena kaiaola.

He kumu nui ʻo Snowmelt i ka wai no nā loko iʻa ʻino ma lalo, akā ke wānana nei ke ʻano o ke aniau e hāʻule ka heleleʻi ma ke ʻano o ka hau i kekahi mau wahi, me nā hopena kaiaola koʻikoʻi. I kēia ʻatikala, hoʻohana ʻia ʻekolu mau palena, e like me ka ʻikepili isotopic o ka wai loko, ka gradients o ka uhi lāʻau kanu ʻāina (mai ka tundra hāmama i nā ululāʻau paʻa) a me ke kōkua topographic e ʻike ai i nā loko i kūpono i ka desiccation ma lalo o nā kūlana o ka wai hoʻoheheʻe haʻahaʻa i nā wahi kai ʻelua - ka Old Crow Plains, Yukon, a me ka Hudson Bay Shoals, Manitoba, Kanada.

Aia nā loko i loko o kahi pāpaʻu a me nā kīʻaha tundra hāmama e hōʻike ana i kahi uku ʻōnaehana ma waena o nā ana hōʻike paleoclimatic o nā wai isotopes wai wai (δ18O) ma luna o nā hoʻouka huakaʻi he nui, i hōʻemi ʻia mai nā cellulose i loaʻa i nā waihona o ka wā i hala. Hāʻawi ʻia kēia uku i ka evaporation ikaika i waiwai ʻia ma 18O e pane ana i kahi haʻahaʻa ma mua o ka awelika o ka wai kahe i nā makahiki i hala iho nei.

ʻIke nō, he nui nā loko i kokoke e hoʻopau i ka hoʻomaloʻo ʻana i ke kau waena o ke kauwela 2010, ka mea i ukali i ka hoʻoilo me ka heleleʻi haʻahaʻa i ke ʻano o ka hau. Ma muli o nā paleoimnological record o kēia ʻano loko, ʻaʻole paha i loaʻa nā wahi maloʻo loa o 2010 i nā makahiki he 200 i hala. ʻO kēia mau hopena e hānai i ka hopohopo no ka hōʻemi ʻana o ka kahe mai ka hoʻoheheʻe ʻana o ka hau e alakaʻi i ka hoʻomaloʻo nui ʻana i nā loko kai pāpaʻu o kēia ʻano ʻāina.

More 'ikepili: Hopohopo ʻo WWF e pili ana i ka wikiwiki a me ka ikaika o ka loliKe nalowale nei ka hau o ka Arctic ma kahi helu moʻoheluKa nalowale hopohopo ʻana o ka hau i ka Arctic

 

Nā kumuhana: Geophysical Research Letters


Hoʻopili ka ʻike o ka ʻatikala i kā mākou kumumanaʻo o ka hoʻoponopono hoʻoponopono. E hōʻike i kahi kaomi hemahema ʻaneʻi.

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