10 New Reconstructions Show Today’s Temperatures Still Among The Coldest Of The Last 10,000 Years

Even though CO2 concentrations hovered well below 300 ppm throughout most of the Holocene, newly published paleoclimate reconstructions affirm that today’s surface temperatures are only slightly warmer (if at all) than the coldest periods of the last 10,000 years.  This contradicts the perspective that temperatures rise in concert with CO2 concentrations.

 Bottom Graph Source: Rosenthal et al. (2013)

1. Even Past Cold Periods Were 0.5–1.5 °С Warmer Than Today

Nosova et al., 2018

“According to the present climate reconstruction, mid Holocene warming started only at 7,700 cal bp, with temperatures higher than now during the mid Holocene period. This warming was due to an increase in winter temperatures (1–5 °С higher than current), while summer temperatures remained relatively stable, with a July temperature<1 °С higher than now. … During the mid Holocene, two cold periods at 6,900–6,500 and at 5,300–5,000 cal bp were observed. Interestingly, during the cold periods, the temperatures exceeded the current ones by 0.5–1.5 °С.”
“The transition from the mid Holocene thermal maximum to the following period occurred without considerable climatic changes. The mean annual temperatures remained much higher than the current ones by 0.5–2.5 °С until 2,500 cal bp. Local maximum temperatures were observed at 4,800, 4,300, 3,500 and 2,900–2,700 cal bp. The present climatic reconstruction demonstrates a gradual cooling down to current levels at ca. 2,500 cal bp, and then followed by a new warming phase with up to 1–2 °С increase at approximately 1,500 cal bp.”

2. Only 3 Of 116 Holocene Temperature Anomaly Records Were Colder Than Today

Bajolle et al., 2018

“The mean annual temperature recorded at the closest meteorological station [La Sarre: 1961–1990] is 0.8 °C, with August temperature averages of 15.0 °C (1961–1990) and 15.4 °C (1981–2010). … During zone Lch1 (8500–5800 cal year BP), the average reconstructed temperature was 16.9 °C, with a decrease from 19 °C (maximum) to 17 °C at the end of the zone. In zone Lch-2 (ca. 5700–3500 cal year BP), temperatures had an average of 16.8 °C, with a decrease from 17.8 °C around 5200 cal year BP to 16.2 °C at 3400 cal year BP. Zone Lch-3 (ca. 3500–1200 cal year BP) started with inferences for high temperatures (19.3–18.5 °C), followed by a decrease to 16.8 °C between ca. 3000 and 2500 cal year BP. An increase (18.3 and 19.6 °C) was inferred for the period between 1800 and 1500 cal year BP. The average chironomid inferred temperature during Zone 3 was 17.9 °C. In the last zone (Lch-4), the temperatures decreased from ca. 17.5 °C at the beginning of the zone to 14.8 °C at the end of the zone. The average during this zone was 16.5 °C. The temperature anomalies show that throughout the whole record, only six of the inferences were colder than the climate normal of 15.4 °C and three were colder than today, with the climate normal of 15 °C (Fig. 4b). The average anomaly from 15 °C (2.10 °C) and from 15.4 °C (1.70 °C) for the whole record showed that the temperature inferences were generally, and significantly, warmer than today.”

3. New England (USA) Colder Now Than Nearly All Of The Last 11,000 Years

Oswald et al., 2018

4. Today’s Temperatures Still Just As Cold As The Global Little Ice Age

Coffinet et al., 2018

“This study represents the first detailed late Holocene quantitative air temperature reconstruction from the RVP [Rungwe Volcanic Province, southwestern Tanzania/East Africa] region. We identified a succession of cold/warm/cold events, largely in phase with the other regional East African climate records and with the cold periods identified worldwide by Wanner et al. (2011). This further supports that global scale processes may be the main drivers of the Holocene climatic variability. Moreover, warm conditions during the MCA [Medieval Climate Anomaly] followed by abrupt cooling during the LIA were observed at Kyambangunguru and elsewhere in East Africa suggesting that these two recent events occurred globally.”

5. Modern Temperatures -2.9°C Colder Than 7,000 Years Ago

Zhao et al., 2018

According to the interpolation of meteorological data of the two nearest weather stations at Linxia (ca. 46 km away; MAT [mean annual temperature] = 7.3 °C) and Minhe (ca. 54 km away; MAT [mean annual temperature] = 8.3 °C)… In this study, we reconstructed mid-late Holocene climatic changes using GDGT distributions in a loess-paleosol sequence in the Lajia Ruins of the Neolithic Qijia Culture, Guanting Basin, in the southwestern end of the Chinese Loess Plateau. … MAT [mean annual temperature] decreased from 11.9 °C to 8.0 °C [today], during the past ca. 7000 yr, and a drastic decline in MAP [mean annual precipitation] (70 mm), accompanied by a 0.8 °C decline in MAT [mean annual temperature], occurred at 3800–3400 yr BP.”

6. Temperatures 7–9°C Higher Than Modern during The Early Holocene

Zheng et al., 2018

“In this study we present a detailed GDGT data set covering the last 13,000 years from a peat sequence in the Changbai Mountain in NE China. The brGDGT-based temperature reconstruction from Gushantun peat indicates that mean annual air temperatures in NE China during the early Holocene were 5–7°C higher than today.  Furthermore, MAAT records from the Chinese Loess Plateau also suggested temperature maxima 7–9°C higher than modern during the early Holocene (Peterse et al., 2014; Gao et al., 2012; Jia et al., 2013). Consequently, we consider the temperatures obtained using the global peat calibration to be representative of climate in (NE) China. … The highest temperatures occurred between ca. 8 and 6.8 kyr BP, with occasional annual mean temperatures >8.0 ± 4.7°C, compared to the modern-day MAAT of 3°C.”

7. 1950-2015 Just 0.7°C Warmer Than Coldest Temps Of The Last 9,000 Years

Harning et al., 2018

“Iceland’s terrestrial HTM [Holocene Thermal Maximum] has previously been constrained to ~7.9 to 5.5 ka based on qualitative lake sediment proxies (Larsen et al., 2012; Geirsdottir et al., 2013), likely in association with progressive strengthening and warming of the Irminger Current (Castaneda et al., 2004; Smith et al., 2005; Olafsdottir et al., 2010). Numerical modeling experiments for Drangajokull suggest that peak air temperatures were 2.5 – 3°C warmer at this time relative to the 1961-1990 CE average (Anderson et al., 2018). … During the Little Ice Age (LIA, 1250-1850 CE), the Vestfirðir region entered the lowest multi centennial spring/summer temperature anomalies of the last 9 ka.  Based on recent numerical  modeling simulations, this anomaly is estimated to be 0.6-0.8°C below the 1950-2015 average on Vestfirðir (Anderson et al., 2018).”

8. 2004-2007 Temps Colder Than All But 3 Other Holocene Periods

Wang et al., 2018   

The average RAN15-MAAT of 18.4°C over the most recent part of the record (<0.8 ka BP) [the last 800 years BP] overlaps with the range of MAATs, ca. 16.2°C to 18.7°C (av. 17.5°C) measured since 1952 at the nearest meteorological station (Yichang, located ca. 100 km away) and is very close to the av. MAAT of 18°C measured directly outside the cave by a temperature logger between 2004 and 2007 (Hu et al., 2008a). This agreement between reconstructed temperatures and instrumental measurements increases our confidence in the potential of the RAN15 proxy. RAN15-MAATs in HS4 vary from 16.5°C to 20.6°C (av. 19°C), during the last 9 ka BP, and broadly follow a long-term trend of declining temperatures in line with declining solar insolation at 30°N in July (Laskar et al., 2004). … Interestingly, the most recent 0.9 ka BP [900 years BP] is distinguished by greater variability with the highest (20.5°C) and lowest (16.5°C) RAN15-MAATs occurring consecutively at 0.6 ka BP [600 years BP] and 0.5 ka BP [500 years BP].” [Surface temperatures dropped by -4.0°C within ~100 years.]

9. 1952-2014 Temps 4.0 to 7.0 °C Colder Than 8,000 – 10,000 Years Ago

McFarlin et al., 2018

“(Greenland)  Early Holocene peak warmth has been quantified at only a few sites, and terrestrial sedimentary records of prior interglacials are exceptionally rare due to glacial erosion during the last glacial period. Here, we discuss findings from a lacustrine archive that records both the Holocene and the Last Interglacial (LIG) from Greenland, allowing for direct comparison between two interglacials. Sedimentary chironomid assemblages indicate peak July temperatures [Greenland] 4.0 to 7.0 °C warmer than modern during the Early Holocene maximum [10,000 to 8,000 years ago] in summer insolation. Chaoborus and chironomids in LIG sediments indicate July temperatures at least 5.5 to 8.5 °C warmer than modern.”

Modern Derived Temps 0.2°C Above Coldest Of Last 14,000 Years

Wu et al., 2018

“Summer temperatures (MJT) at Xingyun Lake in the late glacial were low, increased during the early Holocene, were highest during the middle Holocene, and then decreased during the late Holocene.The range of inferred values [for the Holocene] was 21.0°- 26.5°C. The pollen inferred temperature derived from surface samples (21.2°C), is close to the modern instrumental July temperature in Kunming (22°C), supporting the reliability of reconstructions from down-core pollen assemblages.”

17 responses to “10 New Reconstructions Show Today’s Temperatures Still Among The Coldest Of The Last 10,000 Years”

  1. SebastianH

    1) do you think your cherry-picked locations are a sufficiently representing the global temperature record?

    2) I’m asking because the usual reconstructions for the Holocene don’t vary by this much. Or do you see this differently?

    3)

    This contradicts the perspective that temperatures rise in concert with CO2 concentrations.

    When posted together with that graph … you are basically repeating your demonstration, that you have no clue how CO2 and temperature are connected. Still on this trip of denying that it’s basic physics? And by it I mean the sulubility of CO2 in water in relation to temperature.

    In essence: I call BS on your claim that “newly published paleoclimate reconstructions affirm that today’s surface temperatures are only slightly warmer (if at all) than the coldest periods of the last 10,000 years.” Nearly all global reconstructions joined with the measured temperature increase in the instrumental record show that it’s at least as warm today as in the warmest past periods of the Holocene.

    1. spike55

      So, as usual, ZERO EVIDENCE from seb

      Just mindless yapping.

      I call BS on your comments, seb..

      .. because that is all they are.

      There is no causal link from atmospheric CO2 to temperature.

      YOU HAVE ZERO EVIDENCE that there is.

      You are CLUELESS, in every respect.

      Global temperatures are only just above those of the LIA.

      Despite ALL the data from all over the world..

      .. you are still in a state of manic CLIMATE CHANGE DENIAL.

      1. SebastianH

        Spike55, apparently you have not paid attention in school and don’t pay attention now. That would explain your reply about causal links from CO2 to temperature and lamenting about evidence without providing any yourself. I repeat myself, psychologist would pay to talk to you. Such a fascinating mind …

        1. spike55

          You KNOW there is zero evidence of CO2 causing warming. Sorry basic comprehension is beyond you.

          Your continued desperate attempts at evasion and distraction to avoid providing such evidence are quite hilarious. 🙂

          If you don’t understand basic science.. why do you keep commenting and making an abject fool of yourself ?

          Q1. In what way has the climate changed in the last 40 years, that can be scientifically attributable to human CO2 ?

          Q2. Do you have ANY EMPIRICAL EVIDENCE at all that humans have changed the global climate in ANYWAY WHATSOEVER?

    2. spike55

      Only slight warming in the last 40 years has been from two El Ninos ocean releases.

      Do you have ANY EVIDENCE AT ALL that they were caused by human emissions?

      Apart from the slight beneficial warming since the coldest period in 10,000 years, in what way has the global climate changed?

      STILL waiting ..

      .. but no expectations, except that you will post yet another evidence free, evasion/distraction rant to avoid answering simple questions with REAL EVIDENCE.

      4-7 degrees warmer than now during the Holocene, seb

      Less than a degree of real warming out of the LIA, seb

      The world is still very much in a cold period of this interglacial, and unfortunately, looks like dropping back down, rather than continuing the slight, but highly beneficial natural warming that we have had.

    3. Kurt in Switzerland

      seb:

      You wrote, “Nearly all global reconstructions joined with the measured temperature increase in the instrumental record show that it’s at least as warm today as in the warmest past periods of the Holocene.”

      Do you have an obsession with “reconstructions joined with the measured…”?

      I can only assume you are attempting to paraphrase the visual results presented by Mann et al. some two decades ago, or perhaps Marcott & Shakun from five years ago.

      But if one looks ONLY at proxies, one discovers rather quickly that the modern temperature records diverge from the proxy record over the past century. This suggests that the proxies do not in fact correlate with the modern efforts to calculate a global mean surface temperature anomaly.

      How would you suggest squaring this circle?

  2. Quantum Physics 101; Why CO2 Can’t be Melting the Glaciers and Sea Ice – CO2 is Life

    […] 10 New Reconstructions Show Today’s Temperatures Still Among The Coldest Of The Last 10,000 Years (Source) […]

  3. Bitter&twisted

    Of course the alarmists never, ever cherry-pick😉

  4. Don from OZ

    “This contradicts the perspective that temperatures rise in concert with CO2 concentrations.”
    Which ding bat claims that perspective Seb?

    On a different note Seb I strongly suggest you indulge reading the Quantum Physics 101 referred to in the 2nd last post above.
    The technical article also answers Malcolm Hughes 2009 email that said “… whilst CO2 is a good candidate to explain it (global warming) It is far from proven” The article above shows the proof that it is not a candidate at all.

  5. 10 New Reconstructions Show Today's Temperatures Still Among The Coldest Of The Last 10,000 Years | Un hobby...

    […] K. Richard, September 10, 2018 in […]

Leave a Reply

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this. More information at our Data Privacy Policy

Close