{"id":40090200,"date":"2021-08-18T11:52:55","date_gmt":"2021-08-18T06:22:55","guid":{"rendered":"http:\/\/china-dialogue-ocean-staging.darkbluehq.com\/uncategorized\/18217-ipcc-climate-report-profound-changes-are-underway-in-earths-oceans-and-ice\/"},"modified":"2022-02-10T23:02:26","modified_gmt":"2022-02-10T17:32:26","slug":"18217-ipcc-climate-report-profound-changes-are-underway-in-earths-oceans-and-ice","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/ocean\/18217-ipcc-climate-report-profound-changes-are-underway-in-earths-oceans-and-ice\/","title":{"rendered":"IPCC climate report: Profound changes are underway in Earth\u2019s oceans and ice"},"content":{"rendered":"

Humans are\u00a0unequivocally warming the planet<\/a>, and that\u2019s triggering rapid changes in the atmosphere, oceans and polar regions, and increasing extreme weather around the world, the Intergovernmental Panel on Climate Change warns in a new report.<\/p>\n

\n

Editor\u2019s note<\/p>\n

\n <\/p>\n

This article has been republished from The Conversation<\/a><\/p>\n

\n <\/div>\n <\/div>\n

The IPCC released the first part of its much anticipated\u00a0Sixth Assessment Report<\/a>\u00a0on 9 August. In it, 234 scientists from around the globe summarised the current climate research on how the Earth is changing as temperatures rise and what those changes will mean for the future.<\/p>\n

The Conversation asked\u00a0climate scientist Robert Kopp<\/a>, a lead author of the chapter on Earth\u2019s oceans, ice and sea level rise, about\u00a0the profound changes<\/a>\u00a0underway.<\/p>\n

What are the IPCC report\u2019s most important overall messages in your view?<\/h3>\n

Robert Kopp:<\/strong> At the most basic level, the facts about climate change have been clear for a long time, with the evidence just continuing to grow.<\/p>\n

As a result of\u00a0human activities<\/a>, the planet is changing at a rate unprecedented for at least thousands of years. These changes are affecting every area of the planet.<\/p>\n

\"how
Humans produce large amounts of greenhouse gas emissions, primarily through fossil fuel burning, agriculture, deforestation and decomposing waste. IPCC Sixth Assessment Report<\/a><\/figcaption><\/figure>\n

While some of the changes will be irreversible for millennia, some can be slowed and others reversed through strong, rapid and sustained reductions in greenhouse gas emissions.<\/p>\n

But time is running out to meet the ambitious goal laid out in the 2015\u00a0Paris Agreement<\/a>\u00a0to limit warming to well below 2C above preindustrial levels. Doing so requires getting global carbon dioxide emissions on a downward course that reaches net zero around or before 2050.<\/p>\n

What are scientists most concerned about right now when it comes to the oceans and polar regions?<\/h3>\n

Global sea level has been rising at an accelerating rate since about 1970, and over the last century, it has risen more than in any century in at least 3,000 years.<\/p>\n

In the years since the\u00a0IPCC\u2019s Fifth Assessment Report<\/a>\u00a0in 2013 and the\u00a0Special Report on the Ocean and Cryosphere in a Changing Climate<\/a> in 2019, the evidence for accelerating ice sheet loss has become clearer.<\/p>\n

Over the last decade, global average sea level has risen at a rate of about 4 millimetres per year. This increase is due to two main factors: the melting of ice in mountain glaciers and at the poles, and the expansion of water in the ocean as it takes up heat.<\/p>\n

Ice sheets in particular are primarily responsible for the increase in the rate of sea level rise since the 1990s. There is clear evidence tying the melting of glaciers and the Greenland Ice Sheet, as well as ocean warming, to human influence. Sea level rise is leading to substantial impacts on coastal communities, including a near-doubling in the frequency of coastal flooding since the 1960s in many sites around the world.<\/p>\n

\"Global
Difference between average annual temperature and 20th century average in degrees Celsius, through 2020 <\/em>Chart: The Conversation\/CC-BY-ND\u00a0 (Source:\u00a0NOAA) <\/a>Download image<\/a><\/figcaption><\/figure>\n

Since the previous reports, scientists have made substantial advances in modelling the behaviour of ice sheets. At the same time, we\u2019ve been learning more about ice sheet physics, including recognising the potential ways ice sheets can become destabilised. We don\u2019t well understand the potential speed of these changes, but they have the potential to lead to much more rapid ice sheet loss if greenhouse gas emissions grow unchecked.<\/p>\n

These advances confirm that\u00a0sea level is going to continue to rise<\/a>\u00a0for many centuries to come, creating an escalating threat for coastal communities.<\/p>\n

Sea level change through 2050 is largely locked in: Regardless of how quickly nations are able to lower emissions, the world is likely looking at about 15 to 30cm of global average sea level rise through the middle of the century.<\/p>\n

But beyond 2050, sea level projections become increasingly sensitive to the world\u2019s emissions choices. If countries continue on their current paths, with greenhouse gas emissions likely to bring 3\u20134C of warming by 2100, the planet will be looking at a most likely sea level rise of about 0.7 metres. A 2C warmer world, consistent with the Paris Agreement, would see lower sea level rise, most likely about half a metre by 2100.<\/p>\n

\"\"
The IPCC\u2019s projections for global average sea level rise in metres with higher-impact pathways and the level of greenhouse gas emissions. IPCC Sixth Assessment Report<\/a><\/figcaption><\/figure>\n

What\u2019s more, the more the world limits its greenhouse gas emissions, the lower the chance of triggering instabilities in the polar ice sheets that are challenging to model but could substantially increase sea level rise.<\/p>\n

Under the most extreme emissions scenario we considered, we could not rule out rapid ice sheet loss leading to sea level rise approaching 2 metres by the end of this century.<\/p>\n

Fortunately, if the world limits warming to well below 2C, it should take many centuries for sea level rise to exceed 2 metres \u2013 a far more manageable situation.<\/p>\n

Are the oceans or ice nearing any tipping points?<\/h3>\n

\u201cTipping point\u201d is a vague term used in many different ways by different people. The IPCC defines tipping points as \u201ccritical thresholds beyond which a system reorganises, in a way that is very fast or irreversible\u201d \u2013 for example, a temperature rise beyond which climate dynamics commit an ice sheet to massive loss.<\/p>\n

Because the term is so vague, the IPCC generally focuses on characteristics of changes in a system \u2013 for example, whether a system might change abruptly or irreversibly \u2013 rather than whether it fits the strict dynamic definition of a \u201ctipping point.\u201d<\/p>\n

One example of a system that might undergo abrupt changes is the large-scale pattern of ocean circulation known as the\u00a0Atlantic Meridional Overturning Circulation<\/a>, or AMOC, of which the Gulf Stream is part. Paleoclimate evidence tells us that AMOC has changed rapidly in the past, and we expect that AMOC will weaken over this century. If AMOC were to collapse, it would make Europe warm more slowly, increase sea level rise along the US Atlantic coast, and shift storm tracks and monsoons. However, most evidence indicates that such a collapse will not happen in this century.<\/p>\n

There is mixed evidence for abrupt changes in the polar ice sheets, but clear evidence that changes in the ice sheets can be locked in for centuries and millennia.<\/p>\n

If the world succeeds in limiting warming to 1.5C, we expect to see about 2-3 metres of sea level rise over the next 2,000 years; if the planet continues to warm and reaches a 5C increase, we expect to see about 20 metres over the next 2,000 years.<\/p>\n

Some people also discuss summer Arctic sea ice \u2013 which has undergone\u00a0substantial declines<\/a>\u00a0over the last 40 years and is now smaller than at any time in the past millennium \u2013 as a system with a \u201ctipping point.\u201d However, the science is pretty clear that there is no critical threshold in this system. Rather, summer Arctic sea ice area decreases roughly in proportion to the increase in global temperature, and if temperature were stabilised, we would expect sea ice area to stabilise also.<\/p>\n

What do scientists know now about hurricanes that they didn\u2019t realise when the last report was written?<\/h3>\n

Since the last IPCC assessment report in 2013, there has been increasing evidence that hurricanes have grown more intense, and intensified more rapidly, than they did 40 years ago. There\u2019s also evidence that hurricanes in the US are moving more slowly, leading to increased rainfall.<\/p>\n

However, it\u2019s not clear that this is due to the effects of greenhouse gases \u2013 reductions in particulate pollution have also had important effects.<\/p>\n

The clearest effect of global warming is that a warmer atmosphere holds more water,\u00a0leading to more extreme rainfall<\/a>, like that seen during\u00a0Hurricane Harvey<\/a>\u00a0in 2017. Looking forward, we expect to see hurricane winds and hurricane rains continue to increase. It\u2019s still unclear how the overall number of hurricanes will change.<\/p>\n

The report involved 234 scientists, and then 195 governments had to agree on the summary for policymakers. Does that broad range of views affect the outcome?<\/h3>\n

When you\u2019re writing\u00a0a report like this<\/a>, a key goal for the scientists is to accurately capture points of both scientific agreement and scientific disagreement.<\/p>\n

For example, with respect to ice sheet changes, there are certain processes on which there is broad agreement and other processes where the science is still emerging and there are strong, discordant views. Yet knowing about these processes may be crucially important for decision-makers trying to manage risk.<\/p>\n

That\u2019s why, for example, we talk not only about most likely outcomes, but also about outcomes where the likelihood is low or as-yet unknown, but the potential impacts are large.<\/p>\n

The IPCC uses a transparent process to produce its report \u2013 the authors have had to respond to over 50,000 review comments over the three years we\u2019ve spent writing it. The governments also weigh in, having to approve every line of a concise Summary for Policy Makers that accurately reflects the underlying assessment \u2013 oftentimes making it clearer in the process.<\/p>\n

I\u2019m very pleased that, as with past reports, every participating government has signed off on a summary that accurately reports the current state of climate science.<\/p>\n

This article has been republished from <\/em>The Conversation<\/em><\/a>.<\/em><\/p>\n

\"The<\/p>\n","protected":false},"excerpt":{"rendered":"

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