[et_pb_section fb_built=”1″ fullwidth=”on” _builder_version=”4.4.1″ custom_padding=”0px||0px|||”][et_pb_fullwidth_slider _builder_version=”4.7.7″ min_height=”112px” height=”400px” custom_margin=”0px||||false|false” custom_padding=”0px||18px||false|false” auto=”on” auto_ignore_hover=”on” locked=”off”][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.4.1″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/03\/Br\u010di\u0107_Drvenik02-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.4.1″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/03\/ban2-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.4.1″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/03\/20190228_094232-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.4.1″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/03\/ban3-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.4.1″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/03\/Bijele_stijene-Gorski_kotar-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.4.1″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/03\/ban4-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.4.1″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/03\/ban5-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.7.7″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/04\/20191015_142016a-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][et_pb_slide heading=”Hrvatski geolo\u0161ki institut” _builder_version=”4.7.7″ header_font=”|||on|||||” background_image=”https:\/\/www.hgi-cgs.hr\/wp-content\/uploads\/2020\/04\/20191014_133538-scaled.jpg” background_enable_image=”on” locked=”off” sticky_transition=”on”][\/et_pb_slide][\/et_pb_fullwidth_slider][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.4.2″][et_pb_row _builder_version=”4.4.2″][et_pb_column type=”4_4″ _builder_version=”4.4.2″][et_pb_text _builder_version=”4.4.7″ text_font_size=”32px” header_2_text_color=”#1e5096″ header_2_line_height=”1.2em” header_4_line_height=”1.3em” custom_margin=”||-12px|||”]<\/p>\n
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Istra\u017eivanja siga u Institutu provode se kao podzemni zapis prija\u0161njih klimatskih promjena tijekom kvartara. Sige su sekundarni karbonatni spiljski nanosi koji se formiraju djelovanjem podzemnim voda unutar podzemnih pukotina u kr\u0161u. Stalagmiti nastaju kapanjem vodene otopine sa stropa \u0161pilje te brzina rasta ovisi o sastavu prokapnice i ki\u0161nice te o klimatskim uvjetima. Prema tome, stalagmiti mogu sadr\u017eavati zapis prija\u0161njih promjena okoli\u0161a talo\u017eenja.<\/p>\n
Istalo\u017eeni slojevi se mogu precizno datirati, koriste\u0107i uran-torij (U-Th) i uran-olovo (U-Pb) izotopne metode odre\u0111ivanja starosti te metodu radioaktivnog izotopa ugljika. Debljina istalo\u017eenih slojeva, njihov izotopni i elementni sastav mo\u017ee se koristiti za odre\u0111ivanje prija\u0161njih klimatskih promjena u razli\u010ditim rezolucijama. Prednost kori\u0161tenja siga u paleoklimatskim istra\u017eivanjima u usporedbi s drugim arhivima jest njihova \u0161iroka rasprostranjenost (gotovo u svim klimatskim zonama), dobra o\u010duvanost (za\u0161ti\u0107enost u stabilnim spiljskim okoli\u0161ima kroz duge vremenske periode), vi\u0161estruki klimatski-osjetljivi posredni pokazatelji i relativno visoka rezolucija (godi\u0161nja ili je \u010dak \u010desto mogu\u0107a sezonska rezolucija). Dakle, sige su jedan od mogu\u0107ih na\u010dina utvr\u0111ivanja paleoklimatskih uvjeta i sve ve\u0107i broj istra\u017eivanja \u00a0pokazuje njihovu korisnost u odre\u0111ivanju klimatskih varijabilnosti u pro\u0161losti, uklju\u010duju\u0107i istra\u017eiva\u010de iz Instituta, koji imaju veliku ulogu u pomicanju granica istra\u017eivanja siga u svijetu, \u0161to potvr\u0111uje objavljen znanstveni rad u presti\u017enom \u010dasopisu Science dr. sc. Petre Bajo:<\/p>\n
Bajo et al<\/em><\/strong>. Science 2020; 367: 1235-1239, Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transtion.<\/strong><\/p>\n https:\/\/science.sciencemag.org\/content\/367\/6483\/1235.abstract<\/em><\/a><\/p>\n Iz doma\u0107ih medija:<\/p>\n https:\/\/www.tportal.hr\/tehno\/clanak\/rad-hrvatske-znanstvenice-petre-bajo-o-ledenom-dobu-objavljen-u-prestiznom-casopisu-science-20200318<\/em><\/a><\/p>\n