SD Dojavi
OSMRTNICE
PRETPLATA
PREMIUM
stdClass Object ( [id] => 1159936 [title] => Znanstvenici misle da su slomili jednu od najvećih zagonetki našega doba: je li ovo razlog zašto je uništena drevna civilizacija Maja? [alias] => znanstvenici-misle-da-su-slomili-jednu-od-najvecih-zagonetki-nasega-doba-je-li-ovo-razlog-zasto-je-unistena-drevna-civilizacija-maja [catid] => 423 [published] => 1 [introtext] => [fulltext] =>

Unatoč nevjerojatnim dostignućima u astronomiji, arhitekturi i matematici, civilizacija Maja propala je prije otprilike tisuću godina. Povjesničari su dugo sumnjali da je razlog njihovog nestanka suša, ali do dokaza ranije nije bilo lako doći, javlja National Geographic. 

Suvremena sofisticirana tehnologija, međutim, ne samo da je potvrdila ovu teoriju, već je dala i prilično precizne mjere o suši koja je tada vladala. 

Jezero Chichankanab, na poluotoku Yucatan, bilo je dovoljno blizu središtu civilizacije Maja da može pružiti točne klimatske podatke za regiju. Sredinom 1990-ih uočene su promjene u omjeru teških i lakih izotopa kisika u školjkama na dnu jezera, pa su pokazale da su posljednje godine razdoblja Maja bile relativno suhe.  Međutim, mjerenja u tom razdoblju nisu mogla pokazati koliko je to razdoblje zapravo suho u usporedbi s prethodnim ili kasnijim razdobljima.

Jesu li klimatske promjene doista bile toliko moćne da sruše civilizaciju koja je imala najnapredniji sustav pisanja i koja je mogla izgraditi veličanstvene gradove?

Studija objavljena u časopisu Science daje odgovor na to pitanje i pokazuje da se klima Srednje Amerike dramatično promijenila tijekom tog razdoblja iako još uvijek ne znamo zašto je do toga došlo.

Student Sveučilišta Cambridge Nicholas Evans izmjerio je izotope kisika i vodika u molekulama vode zarobljenim u naslagama gipsa prikupljenim tijekom bušenja dna jezera.

Evans i njegovi kolege zaključili su da je došlo do smanjenja godišnje količine oborina između 41 i 54 posto unutar akvatorija tog jezera, u nekoliko dužih razdoblja unutar 400 godina.

Vlaga je pala za dva do sedam posto, što možda ne zvuči značajno, ali je doista utjecalo na isparavanje vode. To je imalo drastične posljedice na poljoprivrednu proizvodnju, a tijekom najekstremnijih godina bilo je i gore. 

Proučavanje zašto je ta civilizacija propala daje nam važne smjernice o opasnostima koje nam prijete.

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Unatoč nevjerojatnim dostignućima u astronomiji, arhitekturi i matematici, civilizacija Maja propala je prije otprilike tisuću godina. Povjesničari su dugo sumnjali da je razlog njihovog nestanka suša, ali do dokaza ranije nije bilo lako doći, javlja National Geographic. 

Suvremena sofisticirana tehnologija, međutim, ne samo da je potvrdila ovu teoriju, već je dala i prilično precizne mjere o suši koja je tada vladala. 

Jezero Chichankanab, na poluotoku Yucatan, bilo je dovoljno blizu središtu civilizacije Maja da može pružiti točne klimatske podatke za regiju. Sredinom 1990-ih uočene su promjene u omjeru teških i lakih izotopa kisika u školjkama na dnu jezera, pa su pokazale da su posljednje godine razdoblja Maja bile relativno suhe.  Međutim, mjerenja u tom razdoblju nisu mogla pokazati koliko je to razdoblje zapravo suho u usporedbi s prethodnim ili kasnijim razdobljima.

Jesu li klimatske promjene doista bile toliko moćne da sruše civilizaciju koja je imala najnapredniji sustav pisanja i koja je mogla izgraditi veličanstvene gradove?

Studija objavljena u časopisu Science daje odgovor na to pitanje i pokazuje da se klima Srednje Amerike dramatično promijenila tijekom tog razdoblja iako još uvijek ne znamo zašto je do toga došlo.

Student Sveučilišta Cambridge Nicholas Evans izmjerio je izotope kisika i vodika u molekulama vode zarobljenim u naslagama gipsa prikupljenim tijekom bušenja dna jezera.

Evans i njegovi kolege zaključili su da je došlo do smanjenja godišnje količine oborina između 41 i 54 posto unutar akvatorija tog jezera, u nekoliko dužih razdoblja unutar 400 godina.

Vlaga je pala za dva do sedam posto, što možda ne zvuči značajno, ali je doista utjecalo na isparavanje vode. To je imalo drastične posljedice na poljoprivrednu proizvodnju, a tijekom najekstremnijih godina bilo je i gore. 

Proučavanje zašto je ta civilizacija propala daje nam važne smjernice o opasnostima koje nam prijete.

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Artur Widak/NurPhoto/NurPhoto via AFP)
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StoryEditorOCM
Panoramamoćna sila

Znanstvenici misle da su slomili jednu od najvećih zagonetki našega doba: je li ovo razlog zašto je uništena drevna civilizacija Maja?

Piše PSD
17. siječnja 2022. - 14:16
20598250
PREMIUM
Artur Widak/NurPhoto/NurPhoto via AFP)

Unatoč nevjerojatnim dostignućima u astronomiji, arhitekturi i matematici, civilizacija Maja propala je prije otprilike tisuću godina. Povjesničari su dugo sumnjali da je razlog njihovog nestanka suša, ali do dokaza ranije nije bilo lako doći, javlja National Geographic. 

Suvremena sofisticirana tehnologija, međutim, ne samo da je potvrdila ovu teoriju, već je dala i prilično precizne mjere o suši koja je tada vladala. 

Jezero Chichankanab, na poluotoku Yucatan, bilo je dovoljno blizu središtu civilizacije Maja da može pružiti točne klimatske podatke za regiju. Sredinom 1990-ih uočene su promjene u omjeru teških i lakih izotopa kisika u školjkama na dnu jezera, pa su pokazale da su posljednje godine razdoblja Maja bile relativno suhe.  Međutim, mjerenja u tom razdoblju nisu mo...

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14. svibanj 2024 00:42