Dataset Information

Relationship between sea level and climate forcing by CO2 on geological timescales.

ABSTRACT: On 10(3)- to 10(6)-year timescales, global sea level is determined largely by the volume of ice stored on land, which in turn largely reflects the thermal state of the Earth system. Here we use observations from five well-studied time slices covering the last 40 My to identify a well-defined and clearly sigmoidal relationship between atmospheric CO(2) and sea level on geological (near-equilibrium) timescales. This strongly supports the dominant role of CO(2) in determining Earth's climate on these timescales and suggests that other variables that influence long-term global climate (e.g., topography, ocean circulation) play a secondary role. The relationship between CO(2) and sea level we describe portrays the "likely" (68% probability) long-term sea-level response after Earth system adjustment over many centuries. Because it appears largely independent of other boundary condition changes, it also may provide useful long-range predictions of future sea level. For instance, with CO(2) stabilized at 400-450 ppm (as required for the frequently quoted "acceptable warming" of 2 °C), or even at AD 2011 levels of 392 ppm, we infer a likely (68% confidence) long-term sea-level rise of more than 9 m above the present. Therefore, our results imply that to avoid significantly elevated sea level in the long term, atmospheric CO(2) should be reduced to levels similar to those of preindustrial times.

SUBMITTER: Foster GL

PROVIDER: S-EPMC3557064 | biostudies-literature | 2013 Jan

REPOSITORIES: biostudies-literature

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Relationship between sea level and climate forcing by CO2 on geological timescales.

Foster Gavin L GL Rohling Eelco J EJ

Proceedings of the National Academy of Sciences of the United States of America 20130104 4

On 10(3)- to 10(6)-year timescales, global sea level is determined largely by the volume of ice stored on land, which in turn largely reflects the thermal state of the Earth system. Here we use observations from five well-studied time slices covering the last 40 My to identify a well-defined and clearly sigmoidal relationship between atmospheric CO(2) and sea level on geological (near-equilibrium) timescales. This strongly supports the dominant role of CO(2) in determining Earth's climate on the ...[more]

PMID: 23292932

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Project description:BACKGROUND:Empathy is one of the vital personality attributes for all physicians. It is essential for establishing general interpersonal relationships among doctors and patients. Unfortunately, there is evidence for the decline of physician's empathy during the clinical training phase and is a major concern for medical educators worldwide. One of the major factors reported for the decline of this trait is an unprofessional learning environment. OBJECTIVE:This study examines the relationship between empathy level and perception of climate of professionalism among residents. METHOD:The study participants included 70 residents of Obstetrics & Gynecology and Pediatrics departments of a private sector tertiary care hospital in Karachi, Pakistan. Two self-administered internet based surveys - Jefferson Scale of Physician Empathy (JSPE) and "Professionalism Climate Instrument"(PCI) - were administered to assess the level of empathy among the participants and their perception of professionalism in the learning environment. The relationship between the level of empathy and professionalism was analyzed using Spearman rank correlation. RESULTS:The overall response rate was 81.4% with mean empathy level of 103?±?13. The internal consistency of each scale measured by Cronbach's coefficient ? was 0.76 for JSPE and 0.65 for PCI. No significant difference was observed in the mean empathy scores between senior and junior residents of both specialties. Statistically significant difference in empathy scores existed between female and male residents (p?=?0.012; 95% CI, 2.27 to 17.59). The mean PCI score was 106?+?8.88 with no significant difference among residents of two specialties. Professionalism score was not found to vary with either the year of residency or gender. Empathy score and professionalism climate were not found to be correlated (rs?=?0.56, p?=?0.64). CONCLUSION:The findings suggested that empathy is a relatively stable trait that remains unchanged during residency training programs. Female residents had higher empathic concern than the male trainees, however, the empathy level of the participants was not found to be influenced by the climate of professionalism.

Dataset Information

Relationship between sea level and climate forcing by CO2 on geological timescales.

Publications

Relationship between sea level and climate forcing by CO2 on geological timescales.

Similar Datasets

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